the state will recall to the stand doctor martin tobin. in just one moment, your honor. >> not a problem. [inaudible] >> just for the record, could you please state your name and if you feel comfortable, please take your mask off. >> my name is martin tobin. >> mr. blackwell. >> good morning, doctor tobin. >> mr. blackwell. >> thank you for rejoining us and i have just a few follow-up questions i would like to ask you in rebuttal but first just so you are introduced to the jury you are a pulmonologist. >> correct. >> critical care physician. >> yes, intensive care. >> and he studied the physiology of breathing for 46 years. >> correct. >> i want to first ask you about the issue of mr. floyd's potential exposure to carbon monoxide. >> yes. >> were you able to hear testimony regarding this yesterday? >> yes, i was. >> were you able to see this particular slide in the highlighted statement at the bottom is seven minutes mr. floyd's carboxy hemoglobin could have increased by ten or 18%. >> correct. >> would you first just tell us right off the

tobin testified floyd died from a lack of oxygen while being pinned to the pavement with a knee on his neck now the trial of the former police officer derrick jovan was shown animations of him and 2 other officers holding floyd done during the arrest. and it's because of the positioning of the handcuffs at the back there and how he's manipulated with the handcuffs by both the officer sharpen and by officer king how they manipulate the handcuffs and they're pushing the handcuffs into his back and pushing them high then on the other side you have the street so the street is playing a crucial part because he's against a hard ass false 3 so the way they're pushing down on his handcuffs combined with the street his left side and it's particularly the left side we see that it's like the left side is in a vise it's totally being pushed in squeezed in from each side. zeros correspondent john hendren joins us live from minneapolis john hi there what else did the experts testify today have to say. well peter it was day 9 in the murder trial of derek chauvin and it was a red letter day for the pr

dr do you think dr martin tobin's testimony had today? dr martin tobin is the star witness _ testimony had today? dr martin tobin is the star witness of _ testimony had today? dr martin tobin is the star witness of this _ testimony had today? dr martin tobin is the star witness of this entire - is the star witness of this entire trial and — is the star witness of this entire trial and he delivered. he was the most _ trial and he delivered. he was the most effective witness yet indirectly proving that george floyd died from _ indirectly proving that george floyd died from an oxygen deficiency, which _ died from an oxygen deficiency, which led — died from an oxygen deficiency, which led to brain damage and led to his heart— which led to brain damage and led to his heart stopping, and he blamed it on three _ his heart stopping, and he blamed it on three key things. he was lying on the concrete, which made it hard for him to— the concrete, which made it hard for him to breathe, he was handcuffed behind _ him to breathe, he was handcuf

tobin testified that floyd died from a lack of oxygen or being pinned to the pavement with a knee on his neck the trial of the former police officer derrick jovan was shown animations of him and 2 other officers holding floyd down during the arrest alan fischer now reports from minneapolis. focus on this this was a significant day in court a phase of testimony covering important medical evidence the 1st witness martin to open a doctor with more than 40 years experience a pulmonologist a breathing expect mr floyd died from a low level of oxygen and this caused damage to his brain that we see and it also caused. a rift that caused his heart to stop how mr floyd pinned to the ground restrained by police simply couldn't get enough breath to survive that contain forces that are going to lead to the shallow breath are going to be that he's turned prone on the street that he has the handcuffs in place combined with the street and then that he has a knee on his neck and then that he has a knee on his back and on his side dr toobin reviewed all the video and concluded that after he taken his

tobin testified at the trial of derek show of in the form.

tobin i'll get to that in a minute but right now we're in the cross-examination of dr william smock and he has been testifying among other things that george floyd did not have a fentanyl overdose and that's important because the defense is alternative theory of this case is that george floyd died due to a combination of problems heart trouble that he'd had for a while and also a drug overdose or so they are arguing well there you have dr william smock saying he did not die of a drug overdose any ticked off one by one of the reasons why in watching the video you could not see evidence that george floyd was experiencing a kind of overdose and before that you had dr william aizen schmidt who went through the amounts of drugs that were found in george floyd's body he said when it comes to methamphetamine it was the equivalent of one prescribe dose of methamphetamine not much he said and when it comes to 'd fence you know he said it was below the median level found in the driving under the influence cases that he had examined and he summarized by saying he really wasn't that that much d

martin tobin took the stand. >> how long have you been a physician? >> 45 years. >> where did you go to school? >> i went to medical school in dublin and ireland and i took my degree there. >> not that anybody noticed the accent but are you from dublin? >> no, i am from a small village. >> 662 people live in the town of fredford. he went to medical school before getting additional training in london and now in chicago. martin tobin has become one of the leading authorities on pulmonary. he's an expert on how we stay alive moment to moment by breathing. dr. tobin's clarity and authority effortlessly held everyone in his grip for every second that he was speaking. >> how long can the brain go without oxygen. >> if you stop the flow of oxygen to the brain, you lose consciousness in eight seconds. >> eight seconds. the stun silence that you heard after dr. tobin spoke was exactly 8 seconds long. that's how much time it takes from george floyd going to say "i can't breathe" to dying. eight seconds. >> so it tells you how dangerous the concept of if you can

tobin. about. him and his expert opinion what led to george floyd's death he said that george ford died due to a low level of oxygen or a fixation. let's go back and listen. so do you recognize this is this still image that you selected yes. your honor we offer state's exhibit 92 or. 143. and could you tell us what dr toby must this is the significance of this image and what we see here. part you're seeing is likely different than the 2 images but they marry together if you look on the left side you see his finger is pushing against his street the street. you also see the hands here of the officers around his left hand you can see that left hand cupped arm as we discussed or seen a more clearer view here how it's been really round into the back of his back there's just no way he's going to be able to expand that but with the. left image you see the finger on the street then over on the right image you see he's against the tire and to most people this doesn't look terribly significant but to

tobin testified at the trial of derrick chavez the former officer accused of killing floyd. and. now the nigerian army says 10 soldiers and an officer have been killed in an attack in central benue state they were deployed there to tackle local armed groups voting is underway in djibouti meanwhile 73 year old this myeloma is seeking a 5th term in office he's been in power for 22 years main opposition parties have boycotted the vote for small horn of africa nation is located in one of the world's busiest trading routes and is home to several foreign military bases. catherine so she's following the election for us from the kenyan capital nairobi so 1st of all given the opposition called for a boycott how excited are people at the camp coming out to vote catherine. well voting is underway in djibouti and really it depends on who you speak to many people who are in line waiting to vote you know basing their expectations and excitement around president gallup because a lot of them are saying they're satin that he's going to win because the opposition is not there a whole most. ac

martin tobin took the witness stand. >> how long have you been a physician, sir? >> i have been a physician for three months short of 46 years, over 45 years. >> and where did you go to school? >> i went to medical school in dublin, ireland, and i took my degree there. >> not that anybody noticed the accent. but are you from dublin? >> no, i'm not from dublin. i'm from a small village called frankfort in rural ireland. >> 662 people at last count live in the village of fresh? ford in the county of kilkenny where he grew up. its 70 miles west of dublin, where he went to medical school and coming to united states first in miami and now in chicago and along the way, martin tobin has become run u one of the world's leading authorities on pulmonary and critical care mid sin. his work has been published many times in the most important medical journals in the world. he is an expert on how we all stay alive moment to moment by breathing. dr. tobin's clarity and authority effortlessly held everyone in his grip for every second that he was speaking. >> how long can the bra

martin tobin, world renowned physician, pulmonologist, which means he specializes in breathing and lungs. he testified that george floyd died from a lack of oxygen caused by being placed on the street on his stomach with handcuffs, a knee on his neck and a knee on his back, period. dr. tobin also rejected one of the main arguments that we've repeatedly heard from the defense, that mr. floyd died not because of officer chauvin's actions but because of a combination of taking drugs and his pre-existing medical conditions. the pulmonary expert said even a healthy person would have died if they were subjected to what george floyd was subjected to, as cnn's sara sidener report. >> that's the moment the life goes out of his body. >> reporter: today, the prosecutor's expert medical witness did not hold back. >> florida floyd died from a low-level of oxygen. and this caused damage to his brain that we see and it also cau caused pea arrhythmia that caused his heart to stop. >> world renowned expert on breathing and lungs, dr. martin tobin, pointed to the officer's actions, saying george floyd die

tobin: martin tobin. jerry: good morning, mr. tobin. would you tell us what is your current employment? dr. tobin: i am a physician in pulmonary and could all care medicine. jerry: whereabouts? dr. tobin: in chicago at hines va hospital and loyola university medical school. jerry: is hines va hospital a large facility? dr. tobin: it used to be the largest va hospital in the country. it has now been superseded by one or two others. jerry: do you specialize in pulmonology? dr. tobin: i specialize in pulmonology and in critical care medicine. jerry: would you tell the jury what pulmonology is? dr. tobin: pulmonology is the study of the lungs. it deals with all diseases that affect the respiratory system, the lungs, the chest wall. jerry: what are the various components of the respiratory system? dr. tobin: the respiratory system begins at the nose and mouth and a goes down through the back of the throat down to the windpipe out through the bronchial tubes and down to the air sacs. these are the small grape like structures at the bottom whe

martin asked them to do. dr. martin tobin. you know, in touching different parts of they neck, so that they could understand, exactly, what he was talking about when floyd was unable to breathe. pretty remarkable, anderson. >> interesting. sara sidner, appreciate it. thanks. i want to bring in cnn legal analyst, laura coates, former federal prosecutor and defense attorney, mark o'mara. how effective do you think he was? >> oh, he was absolutely the most-compelling witness that we have had, so far. and that includes the emotional testimony that we saw from last week. from the age ranging from 9 years old to somebody more than half a century older. you have had all the law-enforcement officials. no one expected this moment. as opposed to a medical examiner and autopsy to be this captivating. but his methodical approach. his cadence. the rhythm of his information. the way, in which he presented, in very digestible pieces. if you didn't know what a pulmonologist was before he got up there. you certainly were following along with t

martin tobin testimony, and it was so powerful to watch. i wonder from your experience, how would that sort of testimony play with the jury >> shep, i don't think that you can do it any better than dr. tobin did it. i was so impressed with the mind and so easy to overlook the heart. he chose to do it pro bono, and a guy like him would normally charge you $700 an hour and including travel time, and he outlined what did not kill george floyd and that is fentanyl and other conditions. the only thing that is complicated of what killed him, and he listed four factors and one of which is derek chauvin's knee. >> he appeared to me to totally squash the fentanyl argument, and is that the last you expect to hear of it? >> okay. he squashed it for intelligent people i think, for thoughtful people, and no other way to say it, but this whole fentanyl argument, i don't think that it was meant to be a rational train of thought, but it is appealing to the people who appeal to dog whistle terminology and that people might respond to people who might die of

martin tobin on cross examination? >> reporter: yeah, shep, the defense attorney eric nelson really questioned not only dr. tobin's results but his methods as well and stressed that he's a renowned scientist and doctor and that derek chauvin didn't have the luxury of time or his expertise to assess george floyd that day. >> you've taken this case and you've literally boiled it down into a nanosecond. >> i wouldn't say that. >> when we talk about the biology and the physics of this case, these things are working simultaneously, contemporaneously, all together, right? >> that's correct. >> re . >> in an incredibly rapid fashion. >> yes. >> look, as the testimony unfolded for hours, derek chauvin took notes from the defense table. the jury taking notes as well and seemed to pay close attention throughout that's not always been the case during some of the more technicals at pt technical aspects in the trial it was a tough day in the courtroom for members of had his family as the doctor outlined the final moments of george

martin tobin testimony, and it was so powerful to watch. i wonder from your experience, how would that sort of testimony play with the jury >> shep, i don't think that you can do it any better than dr. tobin did it. i was so impressed with the mine and so easy to overlook the heart. he chose to do it pro bono, and a guy like him would normally charge you $700 an hour and including travel time, and he outlined what did not kill george floyd and that is fentanyl and other conditions. the only thing that is complicated of what killed him, and he listed four factors and one of which is derek chauvin's knee. >> he appeared to me to totally squash if fentanyl argument, and is that the last you expect to hear of it >> okay. he squashed it for intelligent people i think, for thoughtful people, and no other way to say it, but this whole fentanyl argument, i don't think that it was meant to be a rational train of thought, but it is appealing to the people who appeal to dog whistle terminology and that people might respond to people who might die of h

they heard this morning from pulmonologist doctor mark martin tobin and now daniel, a forensic toxicologist of the lapse in pennsylvania. taking a 20 minute break, we expect to resume about 4:40 p.m. eastern or 3:40 p.m. central. a reminder, we will re- air today's trial at the 8:00 eastern here on c-span2 as always, all coverage of today in previous days are available at c-span.org. while we wait for the trial to resume, testimony from earlier today. >> just a reminder, you are still under oath. >> yes. [background noises] speak. >> good afternoon. thank you for being with us here today. i'll take a sip, cheers. [laughter] all right so i just want to review a few things, i don't think we'll take too long but you are ultimately approached by the state of minnesota to assist them in the review of the medical issues in this case? >> correct. >> you have volunteered to do the work at no cost? >> correct and that's why you decided not to charge a fee? >> correct. >> when in other cases, what we do you normally charge? >> i charge an hour. my hourly rate is 500 an hour. >> you agreed to waive yo

martin tobin asked if any underlying health conditions could have contributed to his death, tobin said that any healthy person who was subjected to what floyd went through, they would've died. there are fears of fresh large-scale hostilities in eastern ukraine after an escalation of tensions with russia. he is told putin to reduce the military around the border. putin has told him to reduce their actions. navalny's health is deteriorating quickly in prison. supporters have staged a protest to demand navalny receive proper medical care. >> earlier this week, a group of doctors came to the prison camp to get an idea of his state of health, but there were not allowed to enter. >> we will come back tomorrow and the day after tomorrow until they let us in. we will observe how they treat navalny. russia's best-known prisoner -- his also suffering from fever and a cough and he says three fellow prisoners have been diagnosed with tuberculosis. navalny has been diagnosed with two herniated discs. >> he continues to have back and leg pain. sometimes his legs and hands go numb. >> the penal colon

martin tobin, who testified it was derek chauvin's knee on torch floyd's neck that cut off oxygen, that led to a chain reaction that caused him to stop breathing, causing his rain to stop and his heart to stop. he went on to dispel a myth that if someone can speak, they can therefore breathe. it takes a smaller amount of space for someone to speak than it needs -- then they need to breathe. at one point, he stopped the body camera tape and showed floyd struggling so hard to breathe that he was literally using his fingers to try and draw a breath. in cross-examination, eric nelson has been pretty good at picking apart witnesses, but he has not had -- he had nothing to say to the doctor. what we are in right now is the end of the prosecution portion of the case, we've got some more expert this is to go, but it was a banner day for them and all of their experts, basically centered around this idea that floyd was killed directly by the pressure on his windpipe by derek chauvin. >> you mentioned it was day nine of testimony. how long are we expecting the trial to last and wendy think we shou

tobin use of palma knowledge assist in his testimony for the prosecution he said that. shallow breathing lead to george ward's death he said that it showed signs of a brain injury 4 minutes before derek shaven lifted his knees and he's not being cross-examined by the defense and they just a sidebar let's listen back in if partially ingested pills that were determined to can contain. both fentanyl and math and fatten were found partially in just in the backseat of a squad of the squad car and that those pearls had been and come have the d.n.a. of the end of the deceased individual on them meaning that they took them. and those pills would have been in his mouth at about $218.00 or 20. is it fair to say that you would expect the peak for. respiratory depression within about 5 minutes. i mean obviously it will depend on how much of it was ingested to be that it was finding the pills won't tell you anything about whether any of it was ingested or some of it or anything but if there was any amount of it ingested yes the peak would be vibrant. and so if it happened at $28.00

martin tobin. dr. tobin is a pulmonologist. he testified that floyd died from a lack of oxygen. we just learned in the last hour that tomorrow we will hear from the chief medical examiner of hennepin county, the man who con conducted the autopsy. let's listen to the testimony. >> dr. tobin, tell us what's depicted here. describe this for us. >> this is a physiology experiment. what it is looking at is, what is the effort to breathe? that's what's shown along the y axis of the plot. then it is with different levels of narrowing. the very bottom one with the white triangles, the lowest curve, that's normal. there's no narrowing. we see that as the flow varies and shown in red is what would be the normal flow rate in a 46-year-old man. we can see what is the work that is done. if you look at the normal one and then you look at 60% airway narrowing -- this is more narrow than breathing through a straw. you can see there's really no bigger increase in the effort to breathe. it's hardly different from what -- in terms of normal. then if you get 85% narrowing, now you see that the effo

tobin was testifying at the trial of derek show been a former police officer accused of killing floyd last year tobin says floyd couldn't take in enough oxygen while being held down by show been and 2 other offices prosecutors want to prove that it was shavings actions that killed floyd well the defense says drugs and bad health are to blame a turban has told the court that the fentanyl in flawed system did not affect his ability to breathe during his arrest the normal response rate of between $12.22 that's the normal range of response rate and so if it was with fenton expecting response rate 10 instead that you counted here yourself and you can see when you counted yourself that the response rate is $22.00 so basically it tells you that isn't there isn't fent on board and that is affecting his risk free centers it's not having an effect on his research centers. the u.k. has accused man maher bullying its own ambassador after the envoy was locked out of the country's embassy in london show schwann men has been removed from his post after criticizing february's coup and calling for the

tobin, dijo que no habia "absolutamente ninguna forma" de que el pecho de floyd pudiera expandierse para respirar.en una de los videos lo vio usando los dedos y los nudillos contra el piso para intentar levantar el lado derecho de su pecho. escuchemos... borja: durante su testimonio se enfocÓ tambiÉn en explicar, cuatro razones que llevaron a la falta de oxÍgeno a floyd quitÁndole la vida el pasado o 31 de mayo de 2020, desatando repudio nacional por el exceso de fuerza policial. carolina: mientras tanto adolescente de los angeles california, enfrenta cargos dos meses despuÉs de las accidente que le costÓ la vida una mujer de 32 aÑos. el menor manejaba alta velocidad un auto lamborguinni suv. la familia de la vÍctima realizÓ manifestaciones pidiendo que se presentarÁn cargos, el padre del menor publicÓ en instagram el apoyo a la familia muÑoz. borja: en otras noticias evento no autorizado e ilegal en el bosque federal de phoenix arizona, reuniÓ a mÁs de 5000 personas en plena pandemia. la patrulla de protecciÓn forestal publicÓ en la pÁgina de facebook que el evento

martin tobin, a physician giving powerful and difficult testimony to listen to. doctors have been testifying that the viral video of floyd indicates that floyd suffered a seizure. the doctor says he can figure out the precise moment that floyd took his last breath based on signs that clinicians look for in facial movements. >> you can see his eyes. he's conscious. and then you see that he isn't. that's the moment the life goes out of his body. >> he said not related to fentanyl. four forces that restricted his breathing. the handcuffs, the knee on the back of the neck and being on the ground in the prone position. as dr. tobin was cross examined by attorney nelson, he made the point that chauvin doesn't have anywhere near the medical training that dr. tobin has to decipher the medical signs or body functions of george floyd as he pinned down. the defense said that tobin had an opportunity to view the video hundreds of times, slow it down. chauvin didn't have that capability in real time. george floyd went without oxygen for nine minutes between his last breath an

martin tobin who mesmerized the jury with his personalization of the pain that george floyd had to feel who, you know, walked the jury through frame-by-frame in that video and actually showed the jury the moment that the life was literally sucked out of george floyd. so i think that testimony in terms of the medical testimony that has been presented by the prosecution, it has established the key element of this case for the prosecution which is ca caus causation. >> dr. tobin is an expert in breathing. i want you to listen to what we heard from dr. baker who is the medical examiner who performed the autopsy and when he didn't know something or he wasn't sure about something, who he suggested that federal investigators should consult. let's watch. >> i think what you're getting at, counselor, is the court of thing i would prefer to a pulmonologist. i would defer any further questions to a pulmonologist. i would defer that to a pulmonologist or maybe a toxic toxicologist. i think a pulmonologist would be better equipped to answer that question. i would say i answered pulmonologist a half

tobin, dr. martin tobin there you heard with the slight irish accent. he was so pointed and he at one point had the jury try different things to show them exactly sort of how breathing works and use their own hands to touch parts of their neck that he was referring to and almost all, all but three jurors were doing that and at one point, anderson, the judge says to him and the jurors, now, listen, you don't have to do this after an objection from the defense. you don't have to do this. you don't have to do what he sayings but you can if you want. they did continue to do exactly what dr. martin asked them to do, dr. martin tobin in touching different parts of the neck so they could understand exactly what he was talking about when floyd was unable to breathe. >> thank you. want to bring in laura coats. and mark o'mara. you heard sara talk about the medical expert. how effective was he? >> he was absolutely the most compelling witness we've had so far and that includes the emotional testimony from the age ranging from 9 years old to somebody half a centur

dr martin tobin said floyd died from a lack of oxygen that damaged his brain. he told the jury that even a healthy person would have died if someone had knelt on their neck for more than nine minutes. dr tobin cited the factors that he said made it increasingly difficult for floyd. two brave horses that are going to lead to the shallow breath are going to be that he's turned prone on the street that he has the handcuffs in place combined. with the street and then that he has a knee on his neck, and then that he has a knee on his back and on his side. dr martin tobin also testified that show been continued to press his knee on floyd's neck for a full three minutes after floyd had no more oxygen left in his body. temperatures did warm up a few degrees today weekend just around the corner. i'll have the details right after the break right now we go to ktvu is andre senior with a look at some of the stories we're working on for the seven o'clock news on ktvu, plus, we'll let them sail the new tonight the u. s governor that soon the biden administration in an attemp

tobin testified at the trial of derek show of in the former officer queues of killing floyd. and voting is underway in djibouti presidential election the president seeks a 5th term in office. the 1st major legislation for president joe biden is getting the pandemic under control with mcafee because actions of money we bring you the stories and developments that are rapidly changing the world we live in now while the pandemic has devastated many industries it's given a huge boost to the video game site counting the cost on al-jazeera. in japan's ancient and revered traditions they conceded to me gone it's kind of come up all nice if i can get their story a local guide photo all they've got the skills to pull very careful right all. over. the world of japanese sumo wrestling is off limits to most outsiders one with scandals ajit and even when it's life and death i'm only talking more so that the get out of the thing. i hand out the morning star no one no one east goes inside the secretive mood of japanese sumo. but. in the south of japan it is a unique stage of the art gene. fl

martin tobin. he testified floyd died from a low level of oxygen, not because of drugs in the system but the knee on his neck that led to his death. let's begin with ryan on the hill. good morning. >> reporter: good morning to you, erica. this report from t"the daily beast" indicates another relationship between joel greenberg and matt gaetz. there was a massive federal investigation that involves prostitution, sex trafficking, and a number of other crimes. they outline a series of transactions from gaetz's venmo to greenberg's venmo. $900 in transactions from gaetz to greenberg that then ended up going to three unidentified women. now, the women are not under age. there's no direct evidence that they were paid for sex, but it does outline how close this connection is between gaetz and greenberg and that is important because yesterday in an orlando courtroom greenberg and his attorney announce they'd're ready to make a plea deal with federal prosecutors. if that happens, that means there could be a

tobin testified at the trial of derrick cho of in the former officer accused of killing floyd last year president joe biden has announced measures to tackle gun violence which he says is an international embarrassment for the u.s. they are relatively minor changes and by the support of congress to achieve more ambitious goals nothing nothing i'm about to recommend in any way impinges on the 2nd amendment or phony arguments suggests either these are 2nd amendment rights at stake from what we're talking about. but no member no member to the constitution is absolute gun violence in this country is an epidemic we say it again gun violence in this country is an epidemic and it's an international affairs . the african union is dropping plans to secure astra zeneca vaccines from the serum institute of india and says is not because of concerns about a potential and extremely rare link to blood clots will still receive astra zeneca shots for the kovacs assistance scheme. leaders from southern africa have promised a proportional response to armed groups in mozambique who raided the northern town

we will call our first witness doctor martin tobin. >> do you swear or affirm under penalty of perjury that testimony you get will be the truth, whole truth and nothing but the truth . >> if you wouldn't mind removing your master your testimony. and also to make sure the microphone is properly placed have you state your only . >> martin tobin. >> good morning doctor tobin. >> good morning mister blackwell. >> would you tell us what your current employment . >> i am a physician in primary criticalcare medicine . >>whereabouts . >> in chicago at ymca hospital and i will be university medical school. >> and and designs be a large facility ? >> it use to be the largest va hospital in the country i think. it's now been supersededby one or two others . >> and you specialize in pulmonology denmark. >> i specialize in pulmonology and critical care medicine. >> would you tell the jury what pulmonology is. >> will now pulmonology is the study of the lungs. it deals with all diseases affect the respiratory system . the lungs, the chest wall. >> what are the various elements and components of the

martin tobin told jurors chauvin's knees on floyd's back and neck squeezed his airway causing brain damage and cardiac arrest. what did not kill floyd, the doctor said, were his preexisting laelt problems or drug use. the theory being pushed by chauvin's defense lawyers. cnn's omar jimenez is in minneapolis following the trial. >> reporter: good morning, laura. we always knew the medical part of witness testimony was going to be important but i don't think we realized how quickly that would become apparent. now, thursday was the most engaged the jury has been by all accounts in a while as we shifted to that ever important topic of george floyd's cause of death which at least the first doctor who testified thursday said was because of low levels of oxygen that caused damage to the brain. now, over the course of the day he went through diagram after diagram in front of the jury. along the way poking major holes in the defense's argument that floyd's cause of death was largely due to his previous medical history and drugs that were in his system, including fentanyl and methamphetamine. at one

martin tobin. >> in just one moment, you r honor. >> chief ramsey, what could we be seeing? what happens in a rebuttal? >> this rebuttal has to be this fine line that josh campbell talked b he can't make reference to that newly discovered evidence that was not disclosed. all he can do is talk about the aspect of the enlarged heart and respiratory system. the judge already pointed o it this particular witness though, remember, is a pull mondayology expert. the lungs and he can talk about the enlarged heart. it will be odd. >> all right. swearing him in right now? let's go. >> can you restate your name? take your mask off. >> my name is martin tobin. >> mr. blackwell. >> good morning, mr. tobin. thank you for rejoining us. just a few follow up questions to ask you in rebuttal. but first, just so you're introduced to the jury, you're a pulmonologist. >> yes. lung specialist. >> critical care physician. >> yes, intensive care doctor. >> and you studied the physiology of breathing for 46 years. >> correct. >> i want to first ask you about the issue of mr. floyd's potential exposu

tobin was testifying at the trial of derek show in a former police officer accused of killing floyd last year he says floyd couldn't take in enough oxygen are being held down by show been and 2 other officers prosecutors want to prove that it was shoguns actions that killed floyd while the defense says drugs and bad health at a blame. u.k. has accused men march bullying its own ambassador out of the envoy was locked out of the country's embassy in london josh wurman has been removed from his post after criticizing february's coup and calling for the country's democratically elected leader unsung suchi to be released security forces of crackdown on protesters and ethnic armed groups in myanmar reportedly killing $600.00 people there's the headlines next stop one a one east explores the secretive world of japanese sumit do stay with us on our show there he can thanks for much watching my phone off. vaccines a promising path out of the pandemic but implementing the greatest inoculation in history is testing the global community around the world already a clear gap as the marriage betwe

martin tobin, he's on the air now, a critical care specialist. we will listen to his testimony. >> you specialize if pulmonology? >> i specialize in poll monology and in critical care medicine. >> would you tell the jury what pulmonology is? >> pulmonology is the study of the lungs. it deals with all diseases that affect the respiratory system. so the lungs, the chest wall. >> so what are the various elements components of the respiratory system. >> the respiratory system begins in the nose and the mouth and out through the wind pipe and bronchial tubes and down at the bottom to the air sacks. these are the small grape-like structures at the bottom where all the gas exchange takes place, where oxygen gets in and carbon dioxide is removed. >> so this is the system for getting oxygen into the body? >> correct. that is the prime purpose for getting oxygen in. >> now at the hospital, do you work in an intensive care unit? >> yes, i work in the medical intensive care unit. >> and that's considered critical care? >> same as critical care. these words a

tobin was testifying at the trial of direction even a former police officer accused of killing floyd last year. u.k. is accused man mark bullying its own ambassador after the employee was locked out of the country's embassy in london. mina's be removed from his post after criticizing febreze coup. the u.s. has expressed concerns over reports of human rights abuses and atrocities in the region in a call with ethiopia's deputy prime minister last week reports emerged of a massacre by the military president jordan has more from washington d.c. . the u.s. has decision to add $152000000.00 in emergency humanitarian aid for the people living in the 2 grey region of the ethiopian is coming with a warning for the leadership and outis ababa this is net price the state department spokesperson the ethiopian leadership knows just how serious we are it is a message. the leadership has heard directly it is a message we have relayed. different channels different messengers but again the message has been consistent our concern for the reports that are emanating that have emanated from gray we have m

martin tobin, an expert pull -- pulmonologist, who wrote

martin tobin, the world-renowned pulmonologist who testified george floyd died due to a lack of oxygen, not drugs or a heart condition. >> what was so powerful to me is he pointed out when mr. floyd actually lost his life >> reporter: also crucial, the emotional testimony from the bystanders especially the younger ones >> my eyes started watering and i started tearing up everything was so real and so genuine i mean, i felt their feelings i felt their pain. i felt their guilt >> reporter: christensen says she always knew it was a high-profile case but didn't realize the full magnitude of it until she was able to go home and turn on the tv lester >> all right, gabe, thank you. >>> in just 60 seconds our exclusive on the growing showdown between the u.s. and russia >>> growing questions in columbus, ohio after the deadly police shooting of a 16-year-old girl who authorities say was wielding a knife her mother speaking about her loss to nbc's meagan fitzgerald >> what's going on >> reporter: it happened in a matter of seconds >> hey hey! hey! get down get down >> reporter: columbus police

martin tobin, and the prosecution has spent a lot of their case on, and heat set to undermine that and bring back theranularity. this is not in overdose death. and george floyd's drug use, his underlying health problems, and the restraint together caused his death. anchor: we will go over what we heard in court, but i can hear a band in the background and see quite a bit of activity. help us understand what is happening there. larry: yes. there is a bit oa band. i am not sure i can share you the shot. it is a memorial for george floyd. it is also a community center. there is a bookshop. people come in and do performances. this is a new one. people are bracing for the verdict here. some people are optimistic, most are not, but when that verdict does come down, you can expect that will be the central activity with reaction fm the courtroom. anchor: stay with us, larry. let's work through more of what we have heard on this day of the trial. we heard thesecution giving their closing argument. let's listen to some of that. >> this case is exactly what you thought when you saw it first, when

martin tobin cut to the heart of george floyd's death. >> mr. floyd died from a low level of oxygen. and this caused damage to his brain -- >> reporter: a direct and powerful rebuttal of the defense's argument that floyd died because of drugs and underlying medical conditions >> do any of these conditions have anything to do with the cause of mr. floyd's death in your professional opinion whatsoever >> none whatsoever >> reporter: dr. tobin showed jurors a 3-d animation to illustrate what happened he testified that chauvin kept his knee on floyd's neck for more than three minutes after floyd took his last breath >> you can see his eyes, he's conscious and then you see that he isn't that's the moment the life goes out of his body >> reporter: dr. tobin, an expert pulmonologist who wrote what's known in the medical field as the bible on breathing, testified other parts of floyd's body revealed his desperate struggle to survive. >> you see his knuckle against the tire and to most people this doesn't look terribly significant but to a physiologist t

martin tobin. because one of the variables, you had to figure out what actually killed the victim and i always had heard that he had a lot of drugs in his system and when, the most important question to me in this case was what caused floyd's death and the prosecution maintained that it was a stick cr, deprivation of oxygen, and i guess his name was martin tobin, said there was no evidence of an overdose and it was a huge deal because that how did he die? and i thought that was probably the most powerful, i think the most powerful testimony that i saw and of course, a key witness for the defense, david fowler who absolutely admitted that floyd should have been given medical attention. that's the key, when your key defense witness is siding with the prosecution you are in trouble. i will say, overall, i was listening to a friend of mine talk about the relief of this charge coming in, the finding coming in so quickly because it was such a polarizing case dividing the nation and i was thinking, no it

martin tobin told the court he found no evidence ofcarbon dr. martin tobin, one of the nation's leading breathing and lung doctors told the court he found no evidence of carbon monoxide in floyd's blood. prosecutors tried to enter blood work as new evidence: the judge rejected that and said the state should have presented beforehand the judge warned the prosecution he would rule a mistrial if they even mentioned that evidence moving forward david henderson, former civil rights attorney, prosecutors, cnbc contributor you have said from the going, the only chance fo derek chauvin to show remorse, testify and try to win over a jury >> that's right. what the defense is relying on is having an unreasonable person on the jury who hangs the jury that's always difficult to predict. my thoughts about him taking the stand were also based on laying out a defense where it would make sense in light of the defense that they mounted it probably made more sense to not call him to the stand. if he said something to the effect of i did my job, i'll do it again, t

martin tobin, a long and critical care expert testifying that car exhaust did not kill george floyd. but you knew that already. closing arguments are set for monday after which the jury will be sequestered during deliberations. we could see a verdict as soon as next week. joining me now is shaquille brewster who's been following the story in minneapolis. i want to get both sides of this piece for our viewers tonight, shaq. the case itself, your observations of just how things are playing out at this point? >> reporter: well, joy, we really watched this case wrap up fairly quickly. we walked into today expecting to hear from more witnesses. we know that there was a witness that was slated for yesterday who we thought was going to be the first witness today. instead we saw that surprise moment where we heard derek chauvin's voice in the courtroom for the very first time. it was not his testimony, it was instead him saying that he was going to invoke his fifth amendment protections and not testify. we also heard some back-and-forth over that claim that we heard from dr. fowler yesterday

martin tobin for the prosecution. >> you are seeing her fatal injury to the brain from a lack of oxygen. >> reporter: dr. tobin stating that chauvin and the other officers restricted floyd's breathing by flattening his ribcage. and the placement of officer chauvin's knee on floyd's shoulder and neck ultimately caused floyd to have trouble breathing. >> at the beginning, you can see he's conscious. you can see slight flickering. then it disappears. so one second he's alive, and one second he's no longer. a healthy person subjected to what mr. floyd was subjected to would have died. >> even though some of the prosecution witnesses didn't agree on the precise cause of death, they agreed that derek chauvin's actions were the primary cause of death. >> reporter: another testimony key to the prosecution's case, a 9-year-old witness, not shown on camera due to her age. she recalled the moment emts arrived on scene and what she says was said to chauvin. >> they asked him nicely to get off of him. >> and when they asked him nicely to get off of him, what did he do? >> still stayed on him. >> rep

martin tobin, the world-renowned pulmonologist, and eyewitness donald williams, the mma fighter. >> i thought the prosecution was almost doing too much i felt like it was a for sure no-brainer. >> reporter: as for the defense's argument that an angry crowd of bystanders distracted officers >> i thought that was absolutely ridiculous. i thought that was crazy. i was like, if that's the route you're going to go that doesn't even make any sense. >> reporter: mitchell would not say what he thought an appropriate punishment for chauvin would be his sentencing is now scheduled for late june lester >> a rare glimpse in that room. all right, gabe, thank you. >>> in just 60 seconds the struggle to reopen schools. did the president keep his promise? >>> back now with the push to vaccinate more americans after the cdc relaxed its guidelines for mask wearing for those who were fully inoculated. tonight almost 143 million have received at least one vaccine dose miguel almaguer joins us now miguel, what's the aim here >> reporter: lester, the cdc hopes loosening face mask restrictions for the vacci

martin tobin, and eye witness donald williams, the mma fighter. >> i thought the prosecution was doing too much i thought it was a for sure no brainer. >> as for the defense' angry cr officers. >> i was like if that's the route you're going to go, that doesn't make sense. >> reporter: mitchell did not say what he thought an appropriate punishment for chauvin would be the sentencing is scheduled for late june. >> let's turn to our weather and nbc meteorologist janessa webb good thursday morning to you, janessa. >> hey, good morning good morning, everyone we're still watching the severe weather that's been in our forecast all week long it will continue for one more day and then the fronts will make their way through i do have a tornado watch in place through arkansas and sections of texas. that's going to last until 5 a.m. right now the showers are very light but we're going to see the heavier bands throughout the afternoon and into your evening. that's why severe weather is in place for thtennessee e averagek 89 in richmond upper 80s in philadelphia. we have a lot cooler air heading our

doctor says a lack of oxygen and not drugs cause george ford's death when he was pinned by the police martin tobin testified at the trial of derek jovan the former officer accused of killing floyd last year president joe biden has announced measures to tackle gun violence which he says is an international embarrassment for the u.s. he will need the support of congress to achieve more ambitious restrictions nothing nothing i'm about to recommend in any way impinges on the 2nd amendment or phony arguments suggest either these are 2nd amendment rights at stake from what we're talking about. but no member no member to the constitution is absolute gun violence in this country is an epidemic we say again gun violence in this country is an epidemic and it's international that. the african union is dropping plans to secure astra zeneca vaccines from the serum institute of india and says it's not because of concerns about a potential and extremely rare link to blood clots they will still receive astra zeneca shots through the kovacs assistance scheme. there's been more disorder and fighting on the st