the defense resting in the derek chauvin trial. the former officer speaking in court for the first time to invoke his fifth amendment right not to testify. when the jury will hear closing arguments. daunte wright's family speaking out for the first time since the former officer was charged in his shooting death what they're demanding tonight. the u.s. hitting russia with new sanctions. and the warning president biden says he personally gave to vladimir putin and bracing for a blast of spring snow >> announcer: this is nbc "nightly news" with lester holt good evening we may be closer to a definitive answer to one of the nagging questions about covid vaccines and that is will we need a follow-on booster shot later on? well, the head of pfizer is saying that will likely be the case for his company's vaccine, suggesting an annual shot could be in the cards beginning a year after being fully vaccinated the idea, to keep your

body's defenses up against the virus, especially the variants we'll also dig into the number of people infected despite being fully vaccinated some interesting numbers to share with you there. especially considering 126 million have received at least one covid vaccine dose in this country we're also watching hospitalizations tonight at 38,000. let's begin our coverage now with miguel almaguer. >> on the count of three. one, two, three. >> reporter: for the tens of millions of americans inoculated with the pfizer vaccine tonight new word they'll likely need a third shot, a booster dose, within 12 months of being fully vaccinated pfizer's ceo says like the flu shot the vaccine could be annual >> the variants will play a key role. it is extremely important to suppress the pool of people that can be susceptible to the virus. >> reporter: the pfizer news comes as the future of the johnson & johnson shot

remains unclear. but just the decision to pause is having an impact >> i saw patients today who were scheduled for johnson & johnson and when i told them we needed to reschedule they were like no, thank you >> reporter: with 7.6 million americans already inoculated with j&j the six women with rare blood clotting experienced it within two weeks. roughly 3.8 million people are still in that window. some hospitals like this one say in recent days those just inoculated with j&j have been showing up to their e.r.s with no symptoms and no medical problems but are instead overly concerned. today on capitol hill leading health officials sought to reassure the public. at a time when covid cases are climbing, authorities are trying to ensure public confidence isn't dropping miguel almaguer, nbc news >> all right let's put it into context. dr. john torres joins us now john, if pfizer is talking yearly booster shots, what does it say about how long the vaccines provide

protection right now >> we know the vaccines are very effective in providing at least six months of protection from the virus. but until they study immunity recipients six months out we're not going to know conclusively now, pfizer thinks we'll need a booster shot in 12 months' time frame and maybe annually after that. moderna says they're working on a booster shot and hoping to combine it with the flu vaccine so you can get both at once what we don't know at this point is whether you can switch between different types of vaccines for that booster shot but hopefully will soon >> all right, doctor, thank you. let's turn now to the breaking news from chicago. police video just released of a deadly officer-involved shooting this one involved a 13-year-old boy. it happened late last month. we need to warn you the images are disturbing rehema ellis is there. >> reporter: in the dramatic police body cam video officers are responding to a call of shots fired in the early morning hours of march 29th in chicago's little village neighborhood in a matter of seconds a pursuit turns deadly

>> stop right now! show me your [ bleep ] hands. stop it. [ gunshot >> reporter: 13-year-old adam toledo was killed. police say a gun was found at the scene >> the officer screamed at him, "show me your hands. adam complied. turned around. his hands were empty when he was shot in the chest. >> reporter: so far police have not released any information about the officer. they arrested a 21-year-old man who they say was with toledo at the time >> spin. put your hands behind your back. >> reporter: ruben roman, arraigned saturday, was charged with child endangerment and reckless discharge of a firearm. chicago's mayor became emotional today talking about the video. >> no parent should ever have a video broadcast widely of their child's last moments. >> reporter: earlier this week toledo's family saw the video and did not want it seen immediately but today they agreed it should be viewed by the public and they called for

calm now that the video has been released, the city is on edge tonight. and bracing for more demonstrations lester >> all right, rehema, thank you. in minneapolis high drama in the murder trial of derek chauvin. the defense resting its case and the former police officer making his decision on whether to testify about the death of george floyd our gabe gutierrez has late details >> reporter: it had been one of the largest questions looming over the trial, whether derek chauvin would take the stand in his own defense. today the answer >> i will invoke my fifth amendment privilege. >> reporter: chauvin told the judge without the jury in the room that he would not testify. >> i have advised you and we have gone back and forth on the matter, would be kind of an understatement right? >> yes, it is. >> reporter: george floyd's younger brother rodney says it had been on his mind >> i was hoping to see him get on that stand. but he didn't do it. >> you wanted to see him testify? >> yeah. i wanted to see him accept some accountability >> reporter: but legal

experts say chauvin's choice is no surprise. >> the biggest risk for putting derek chauvin on the stand is that he does the exact opposite of what you want him to do instead of humanizing himself he comes across as looking cold to the jury, which further proves what the state is already trying to establish, that he's the direct cause of george floyd's death. >> reporter: also today prosecutors tried to introduce as new evidence test results that specifically measure the carbon monoxide in floyd's blood. the judge did not allow it >> it's untimely >> reporter: scolding them for waiting until the last minute and warning that bringing up the previously undisclosed lab test to the jury could result in a mistrial >> this late disclosure is not the way we should be operating here >> reporter: instead the prosecution called a sole rebuttal witness, dr. michael tobin, back to the stand. the world-renowned pulmonologist disagreed with yesterday's defense expert who testified exhaust from the police squad car could have been one of the contributing factors in floyd's death

>> i believe it is not reliable >> reporter: closing arguments are now set for monday then the case will go to the jury, which will be sequestered. >> if i were you, i would plan for long and hope for short whether it's an hour or a week, it's entirely within your province >> gabe, i'm curious why is the court waiting until monday for closing arguments? >> reporter: well, lester, the judge had indicated that he did not want the jury deliberating this weekend. also, the prosecution and defense are still hammering out the exact wording for jury instructions, lester >> gabe gutierrez tonight, thank you in just 60 seconds, packing the supreme court. the controversial proposal in congress to expand it to 13 justices and in our series "american extremism," a program to help people get out of hate groups

tension remains high in brooklyn center, minnesota this evening. the former police officer who shot and killed daunte wright during a traffic stop making her first court

appearance after being charged with manslaughter as his family speaks out tonight. ron allen is there >> we're still never going to be able to see our baby boy that we're never going to have again >> reporter: tonight daunte wright's family demanding tough justice for kimberly potter >> if we can have life we want life we've got to go life without him. we've got to go life without him. >> reporter: the former police officer in court today the media barred from showing it to the public charged with second-degree manslaughter facing up to ten years in prison for killing wright during a traffic stop his family able to see potter in court on zoom >> it hurt my heart to see her sitting there. so many emotions flowed through my body i had hate i had sadness. i had anger. >> reporter: overnight a fourth night of outrage. hundreds of officers moving in to enforce the curfew >> get back! >> reporter: our nbc news team briefly detained by

authorities, then released at least two dozen arrests. today minnesota's governor, who said he spoke to wright's family, vowing to push for police reforms >> you're less safe to be black in minnesota than you are to be white right now. >> reporter: meanwhile, wright's family planning his funeral for next thursday >> nobody should have to go through this i don't care white, black, brown, red, orange, whatever you are. >> reporter: ron allen, nbc news, brooklyn center, minnesota. all right. let's switch gears to the biden administration's tough new sanctions on russia for interfering in american presidential elections and those hacking attacks on u.s. government agencies and big companies. let's get more from andrea mitchell. >> reporter: as tensions rise with russian troops massing on the border with ukraine, the biden administration today slapping tough new financial sanctions on moscow for a massive hacking operation against government agencies and the nation's largest companies, interfering in u.s. elections and bullying ukraine

the state department also expelling russian diplomats the u.s. says are spies president biden warned russian president putin of the sanctions in a call but also proposed the two meet at a summit. >> i was clear with president putin that we could have gone further but i chose not to do so i chose to be proportionate. >> reporter: russia will certainly lead to a decisive rebuff. meanwhile, only hours after the president's historic decision to withdraw u.s. troops from afghanistan, secretary of state blinken made a surprise trip there today. >> i know this is a moment for many of mixed emotions these are hard choices, hard decisions. >> reporter: but the cia warns there's a significant risk al qaeda could regroup. the military wanted to leave a small force. afghans worry the taliban will take over and women and girls lose their rights and the taliban tonight is declaring victory. lester >> andrea, thanks. a lot of talk right now in washington over the

idea of court packing. some progressive democrats today calling to expand the number of justices on the supreme court. and it is sparking a backlash tonight peter alexander tells us more. >> reporter: it would be a monumental change for an institution that has not added justices in more than 150 years. but tonight several progressive democrats say they want to increase the number of seats on the supreme court from 9 to 13 >> we are here today because the united states supreme court is broken. it is out of balance and it needs to be fixed. >> reporter: that democratic plan would make the court liberal after former president trump's picks created a 6-3 conservative majority president biden as a senator criticized court packing as a bonehead idea. but just last week launched a commission to study adding more seats. speaker nancy pelosi won't bring the democratic proposal to the floor but did not rule it out in the future >> i think it's an idea that should be

considered >> reporter: the late justice ruth bader ginsburg opposed it. >> if anything would make the court appear partisan it would be that >> reporter: and republicans are slamming it as a dangerous liberal power grab >> i can tell you what court packing is, though it will be the end of the supreme court's legitimacy and the end of the rule of law in america. >> reporter: the pressure on president biden from progressive democrats is likely only to grow with his court commission expected to release its report this fall lester >> all right, peter, thank you. in our series on american extremism now you've heard us reporting on the growing threat, but tonight hallie jackson looks at a rescue program for people caught up in hate. >> do you know if he's ever condoned violence >> reporter: at parents for peace the phones keep ringing. >> when covid happened, our help line tripled >> reporter: executive director miriam churchill says it's not just because of the pandemic did the events of january 6th have any impact on your help line that you could see? >> yes the help line number was just hot, hot, hot.

>> reporter: on the line, people who want to get their loved ones out of all kinds of hate groups ideologies from white supremacy to islamic radicalism >> people that are using hate, they are >> reporter: it's why they do interventions. these days on zoom and we were granted rare access to listen in as their caller joined on speaker phone. >> we agree your husband needs help >> i appreciate the support. >> reporter: we're obscuring her identifying details but can say she wants help for her husband, who drinks, goes online, and sinks deeper into hate >> he would say if half the population were wiped out things would be better. >> was there a point when you saw that your husband was getting increasingly radicalized? >> yeah. after the capitol riots. >> features a photo of a former white supremacist.m with my

husband, this is what might be able to reach he says he joined the kkk in 2013 after he left the army following a bad humvee crash and got addicted to painkillers, then crystal meth you were actually training other members of the klan to fight >> yeah. yep. >> reporter: a 2015 documentary shows buckley with his then preschool-age son. >> white power >> white power >> i was grooming him. he threw a fit until we made him a robe that matched mine. >> reporter: in 2016 his wife reached out for help and within weeks another former white supremacist showed up at buckley's door for an intervention. >> it was the most agonizing, exhausting, emotional roller coaster that i've ever been on. >> reporter: buckley is now helping others out of hate. >> for every one that i recruited while i was in, i can take ten more back. >> reporter: new research from rand shows stigmatizing extremists or punishing them can be

counterproductive. so parents for peace looks for other ways to help people who love people who hate >> we are guiding families to be first responders >> reporter: like that help line caller who's separating from her husband. >> this is a shock to the system but it's starting to have the effect that i hoped for him, is that he's reaching out for help now. that's why i'm trying to do what i'm doing with love, because what else can combat hate better than love? >> reporter: for her now it's hope over hate hallie jackson, nbc news, washington we'll take a short break. up next, who's getting covid after vaccinations what you need to know.

a blast of spring snow is taking aim tonight. winter storm alerts are in effect for parts of new york and new england. high elevations could get up to 10 inches. more now on the race to vaccinate. the cdc releasing its first data on covid breakthrough infections in a small number of fully vaccinated people. so what is your potential risk tom costello with a reality check. while more than 76 million americans have now been fully vaccinated, the cdc reports a very small number of breakthrough cases. people contracting covid despite being vaccinated so far 5,800 known cases, most of them women. 40% involve people over the age of 60 7% had to be hospitalized 1%, 74 people, died. experts say the infections are similar

to people coming down with the flu despite getting the flu vaccine. ariel silver got covid six weeks after her second covid vaccine dose >> for two days i was in bed very sick, sleeping all day i had to cancel all my work phone calls it hit me hard for sure >> at a certain point my fatigue went from oh my god, i'm tired to oh my god, i can't really move. >> reporter: dr. evelina gravener also got sick after being vaccinated >> i'm actually afraid to think what my symptoms could have been like if i wasn't vaccinated >> reporter: the data tells the story, showing the pfizer and moderna vaccines are at least 94% effective in preventing severe disease. the j&j vaccine, 86% effective in preventing severe disease. that means only a small percentage of vaccinated people are likely to still get covid, though most should not end up in the hospital >> the vast, vast majority of people who have been vaccinated and get covid, they're

going to have mild illness, maybe moderate illness and should be able to recover at home. >> reporter: the covid vaccines actually provide far more protection than the typical flu vaccine, which has been 50% to 60% effective in recent years and the current vaccines do appear to protect against the uk variant, now the most common strain in the u.s. the biggest concern is that people who do become sick despite being vaccinated could still spread the virus to others. infectious disease experts point out no vaccine offers 100% protection lester >> we keep learning so much about all this. tom, thank you up next we'll celebrate the enduring legacy of a music trailblazer.

finally, she would have turned 50 this week now 26 years after tejano superstar selena's tragic death, her music is inspiring a new generation here's morgan radford. >> reporter: she's known as la reina, la leyenda, the queen of tejano but for millions of fans around the world she's known by one name selena >> an inspiration for all of us. especially for the latino community >> i think of her as a role model >> our moms listen to the music and so they'll put it on. [ speaking foreign language ] >> when they're cleaning the house >> yeah. >> reporter: born 50 years ago, selena quintanilla became one of the most influential latin artists of all time, debuting in spanish with a self-titled album in 1989. and then in english, becoming the first

latin artist to ever top the billboard 200. all before the age of 24 her life tragically cut short in 1995 by a fatal gunshot from her former fan club president. and yet today her legacy is greater than ever her music now inspiring a new generation ♪ bidi bidi bom bom ♪ with more than 213 million streams on spotify this year alone and through the hit series "selena" on netflix. now entering its second season. what did it mean for latinos to have someone like selena then, and what does it mean now >> the selena story is inspiring not just to latinos but also to anyone who feels like an outsider around the world. >> reporter: an influence that still resonates today. >> she says the impossible is always possible >> selena taught you that >> yeah. >> reporter: morgan radford, nbc news, los angeles. and before we go a note about "inspiring america. it's expanding into a new franchise across the nbc universal news

group to honor people making an impact kicking off with a special primetime event i'll host with savannah guthrie and hoda kotb on may 1st we'll reveal the 2021 inspiration list, featuring the stories of some of the people making a real difference in our country. that's "nightly news" for this thursday. i'm lester holt. please take care of yourself and each other. [cheers and applause] ♪ ♪ ♪♪ i wanna thank you ♪ ♪ for giving me the chance to breathe ♪ ♪ you waited so patiently ♪

♪ while i got it together ♪ ♪ while i figured it out ♪ ♪ i looked but i never touched ♪ ♪ 'cause in my heart there was a picture of ♪ ♪ us ♪ ♪ holdin' hands makin' plans ♪ ♪ and now i understand ♪ ♪ what a girl wants what a girl needs ♪ ♪ whatever makes me happy sets you free ♪ ♪ and i'm thanking you for knowing exactly ♪ ♪ what a girl wants,what a girl needs ♪ ♪ whatever keeps me in your arms ♪ ♪ and i'm thanking you for giving it to me ♪ ♪ what a girl wants what a girl needs ♪ ♪ sensitive courageous sexy cool like you ♪ ♪ what a girl wants what a girl needs ♪ ♪ you gotta let her know how

much you ♪ ♪ how much you care about her, i swear ♪ ♪ you're the one who always knew ♪ ♪ what a girl wants what a girl needs ♪ ♪ whatever makes me happy sets you free ♪ ♪ and i'm thanking you for giving it to me ♪♪ [cheers and applause] >> kelly: [screams] welcome to "the kelly clarkson show"! give it up for my band y'all! playing ms. christina aguilera! i like your spin, jaco, that was good. that's the judith hill version of that song, because i was watching "the voice" years ago and this chick came on stage and i was like what! and it's one of my favorite things that anyone has ever done with the cover of a