>> pelley: tonight, the f.b.i. zeros in on a picture from the boston bombing. one security camera caught a person who is now the subject of a manhunt, and we know more about the marathon bombs from the parts found in the wreckage. bob orr, john miller and elaine quijano on the investigation. the senate has decided the fate of national gun control. >> so, all in all, this was a pretty shameful day for washington. >> pelley: chip reid has the results. a threat to the president was intercepted before it reached the white house. wyatt andrews has the story. there's a break in the case of the murdered prosecutors in texas. manuel bojorquez is there. captioning sponsored by cbs this is the "cbs evening news" with scott pelley.

>> pelley: good evening. we have uncovered some new developments in the boston marathon bombing, and we will have those in just a moment. but first, there is a major breaking story out of washington tonight: the gun control legislation written after the newtown massacre has been scuttled in its entirety by the united states senate. moments ago, standing with parents from newtown, connecticut, the president railed against the senate. >> so, all in all, this was a pretty shameful day for washington. but this effort is not over. i want to make it clear to the american people, we can still bring about meaningful changes that reduce gun violence so long as the american people don't give up on it. >> pelley: of course, opponents of gun control are elated by the decision, and we will start our coverage with chip reid at the capitol. >> on this vote, the yays are 54, the nays are 46. >> reporter: for supporters of gun control, including vice

president joe biden, it was a major defeat. they fell short of the 60 votes needed to adopt an amendment requiring background checks for people who buy guns at gun shows and over the internet. under current law, background checks are required only for sales handled by licensed gun dealers. 60 votes were required because that is what it would take to overcome a republican-led filibuster. all but four republicans opposed the background check amendment. it was a resounding victory for the powerful national rifle association and its supporters, including republican chuck grassley of iowa. >> expanded background checks would not have prevented newtown. criminals do not submit to background checks now, they will not submit to expanded background checks. >> reporter: senators were lobbied this week by the president and former congresswoman gabrielle giffords.

many newtown parents who lost children in the elementary school massacre came to the capitol. last week, they met with senator joe manchin of west virginia. he's a gun rights supporter but also the cosponsor of the background check amendment. after meeting with the parents, he said this: >> i'm a parent. i'm a grandparent. i can't imagine. i just can't imagine. >> reporter: today, manchin made a final appeal after it was clear he and the newtown families were going to lose. >> if you want to remember those 20 babies, beautiful children and the six brave teachers, and you want to honor the most courageous family members i have ever met in my life, please consider you should vote for this bill. >> reporter: the senate also voted down amendments to ban many military-style assault weapons and magazines that hold more than ten rounds. and, scott, that leaves the gun control bill in shambles. democratic senator richard

blumenthal of connecticut said today this is the saddest day of his years in public life. >> pelley: chip, thank you very much. a short time ago, mr. obama brought some of the newtown families and gabrielle giffords into the rose garden at the white house. major garrett was there. major? >> reporter: scott, somber and frustrated, president obama said the gun control debate will not end because the senate could not muster 60 votes for expanded background checks. he stood, as you said, with some of the sandy hook families. mark barden, who lost his son daniel in that mass shooting, spoke first and said washington has not heard the last of this issue. >> we'll return home now disappointed but not defeated. we return home with a determination that change will happen. maybe not today, but it will happen. it will happen soon. we've always known this would be a long road, and we don't have the luxury of turning back. we will keep moving forward and

build public support for common- sense solutions in the areas of mental health, school safety and gun safety. >> reporter: with his wife and two surviving children beside him, barden spoke of his son daniel and recited what is known in newtown as the sandy hook promise. >> our hearts are broken. our spirit is not. >> reporter: president obama said the legislation's failure was due to fear-mongering and misinformation. >> but instead of supporting this compromise, the gun lobby and its allies willfully lied about the bill. they claimed that it would create some sort of big brother gun registry even though the bill did the opposite. this legislation, in fact, outlawed any registry. plain and simple, right there in the text. but that didn't matter. >> reporter: the president questioned what the gun lobby will gain from keeping things as they are now.

>> i've heard some say that blocking this step would be a victory. my question is, a victory for who? a victory for what? all that happens today was the preservation of the loophole that lets dangerous criminals buy guns without a background check. that didn't make our kids safer. >> reporter: the president placed phone calls to senators on this issue, scott, yesterday and this morning, even amid briefings on the latest on the boston marathon bombings. the white house says the president will not let this issue die and will keep faith with those families who want him and this white house to keep pressing. >> pelley: major, thank you. late today, the national rifle association called this gun control legislation "misguided" and said the provision for tougher background checks would "have criminalized certain private transfers of firearms between honest citizens requiring lifelong friends, neighbors and some family members to get federal government permission to exercise a fundamental right or face prosecution."

now to the new developments in the boston bombing. it turns out lord & taylor had exactly what the f.b.i. was shopping for: an important new lead. during the attack, a store security camera captured the image of a man with a backpack. that video, along with cell phone records and bomb fragments, are pieces of a puzzle, and bob orr has been putting it together for us. bob? >> reporter: scott, investigators will tell you they are making solid progress in the hunt for the boston bomber or bombers. surveillance pictures and cell phone records may help the f.b.i. close in on at least one possible suspect. sources say investigators are trying to identify a person described as a young white man who is standing in the crowd near the scene of the second bombing just before the device exploded. a surveillance camera at a nearby lord & taylor department store captured images of the man who was carrying a backpack and talking on a cell phone.

sources say he was wearing a black jacket, gray hoodie and a white baseball cap which was backwards on his head. investigators say the man, who seemed to be alone, put the backpack on the ground. then, when the first explosion occurred at the finish line about 100 yards down boylston street, he took off. ( screams ) just a few seconds later, the second bomb exploded near where the man had been standing. investigators now are going through cell phone logs to determine who made calls from that location near the time of the explosions. sources say the f.b.i. is working with a list of names of cell phone owners and attempting to match one of those to the unknown man on the surveillance tape. sources say forensic experts will attempt to use facial recognition software and compare the images from the surveillance camera to photo i.d.s connected to known cell phone users. now, officials say so far they have not identified that mystery

man, and they're not yet calling him a suspect. but this is clearly a strong lead, scott, in what's becoming a very tough investigation. >> pelley: bob, thank you. as bob mentioned, that store video is just one piece of the evidence, and we asked elaine quijano to tell us what else the f.b.i. has and what it's looking for. >> reporter: police are combing the 12-block crime scene around boylston street searching for more pieces of the two pressure cooker bombs. these law enforcement photos show some of what they found. there's this piece of a circuit board and nails packed into the bomb that ripped through the crowd. all of the components are readily available. we were able to figure out the bomb's battery is common in power packs for remote control toys. they can be bought at almost any hobby shop. when pressure cooker bombs detonate, energy from the explosion sieve initially contained inside the cooker. then, as pressure builds, the cooker and its contents break

apart with greater force. experts estimate the boston bombs shot out shrapnel at a speed of several hundred miles per hour. the bombs are being painstakingly reconstructed at the f.b.i. lab in quantico, virginia. any manufacturer numbers on the components may help lead investigators to the stores where they were sold. pressure cooker bombs are popular terrorist weapons because the parts can be bought at different stores and, scott, none of those components alone could arouse suspicion. >> pelley: elaine, thank you. also following the investigation is our senior correspondent john miller, a former assistant director of the f.b.i. john, what have you learned today? >> well, the big case today was whether to make the case to release that photo and go out and say "this is the person we're looking for" or to hold that back. and it's been a tough call. for investigators, there's always a difficult choice because if the person doesn't know you're looking for him, he may stay in place, you may catch up to him. if he does know you're looking

for him, he may run. on the other hand, if you don't get him, it's always great to enlist 20 million or so more eyes in the public who may be able to give you a location right away. that's not going to happen tonight anymore. it was going to happen earlier, they've rethought that. it may happen with the release of that picture tomorrow. they're reassessing. >> pelley: we'll watch for it. john, thanks very much. 63 of the more than 170 people who were wounded are still in the hospital tonight. 12 of them are in critical condition. today, we learned the identity of the third person who died. lu lingzi from china was a graduate student at boston university. hundreds of people attended a vigil in dorchester last night for martin richard, who was killed as he watched the marathon. there will be an interfaith prayer service in boston tomorrow at the cathedral of the holy cross. president obama will attend and cbs news live coverage of that service will begin at 11:00 a.m. eastern time.

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to confirm that first test result. ricin is easy to make, and a few grains can be lethal when s haled. wyatt andrews reports that the envelope sent to the president and another sent to a u.s. etnator were both intercepted. >> reporter: the letters set off alarms at two complexes in maryland where the u.s. post office intercepts mail addressed dd federal officials. outside those facilities today, hazmat teams checked for ricin contamination. according to the f.b.i., the grtters containing a white granular substance were sent to mississippi senator roger wicker and to president obama. two rounds of preliminary tests suggest the letters contain ricin, a poison than originates in castor beans. however, definitive tests on the letters are still being conducted. white house spokesman jay carney said the president was never in danger. >> materials that are suspicious or substances that are found to be suspicious at remote locations are then sent for secondary and more intense testing, and that process is

under way now. >> reporter: the f.b.i., after reviewing the letters, says for now there is no indication of a connection to the attack in boston. the letters were mailed from memphis, tennessee, last week on april 8 and seemed to have come from one individual who wrote this: >> reporter: because the other reason that the f.b.i. sees no connection to boston is a matter of timing. kenneth curtis of tupelo, mississippi, has been taken into custody and charged with sending the letters. the f.b.i. believes curtis has sent over letters with similar content to other members of congress in the past and that pattern helped lead to this arrest. the presence of small amounts of ricin in these letters has now been confirmed.

wyatt andrews, cbs news, washington. >> pelley: britain said goodbye today to the iron lady, margaret thatcher. her funeral at st. paul's cathedral was attended by queen elizabeth and dignitaries from 170 countries, including three former u.s. secretaries of state. thatcher was great britain's first female prime minister. she died of a stroke last week at 87. there has been an arrest now in the murders of two texas prosecutors. we'll have that next. if you have high cholesterol, here's some information that may be worth looking into. in a clinical trial versus lipitor, crestor got more high-risk patients' bad cholesterol to a goal of under 100. getting to goal is important, especially if you have high cholesterol plus any of these risk factors because you could be at increased risk for plaque buildup in your arteries over time. and that's why when diet and exercise alone aren't enough to lower cholesterol

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>> pelley: when two prosecutors >> pelley: when two prosecutors were murdered in texas this year, it sent shivers through law enforcement. well, tonight, authorities in kaufman county believe they have solved both murders. the wife of a former justice of the peace was charged with capital murder today. her husband is already in jail on a related charge. here's manuel bojorquez. >> reporter: police arrested kim williams early this morning. according to this affidavit, police say she confessed to participating in the plot to kill the county district attorney, his wife and a top prosecutor, and she claims it was her husband eric who pulled the trigger. she did not say why, but the affidavit points out eric williams had lost his job as justice of the peace after an investigation by district attorney michael mcclelland and prosecutor mark hasse. they used this surveillance video to determine williams stole office computers. he denied it.

>> there's three monitors missing. one's on your desk right now. >> reporter: today's affidavit says hasse and mcclelland believed williams was a threat to their personal safety, and both men regularly carried handguns after williams lost his job. hasse was gunned down just steps from the county courthouse in january. bruce wood is a county judge. after the first murder, the murder of mr. hasse, what did district attorney mcclelland tell you? >> mr. mcclelland indicated to me very early on the day of mark's murder that he felt like the person that needed to be investigated was eric williams. >> reporter: and what did you think about that? >> my belief was is that certainly he would be investigated. >> reporter: mcclelland and his wife cynthia were shot and killed in their home two months later. here's what eric williams told our station in dallas/fort worth two weeks ago. >> my heart goes out to all the families that have been affected by this tragedy. >> reporter: a search last

weekend of williams' home, his in-laws' home and a storage facility found multiple guns and a car similar to one spotted near the mcclelland shooting. the williams are being held here at the kaufman county jail. kim williams could face the death penalty if she is convicted. scott, it's expected eric williams will be charged in the murders tomorrow. >> pelley: manuel, thank you. we wanted to note the passing of our friend pat summerall, the sportscaster with the majestic voice. he spent much of his career at cbs sports after playing ten years in the n.f.l., mostly as a kicker. summerall was best known for calling n.f.l. games with john madden for 21 seasons. he fought hard to overcome alcoholism and underwent a liver transplant in 2004. pat summerall died of cardiac arrest. he was 82. if there is any doubt that america is a beacon to the world, wait until you hear this survivor's story, next.

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we end tonight with a reminder that people come here from all over the world yearning to taste that freedom. one survivor of the genocide in rwanda achieved her american dream today. bob simon first introduced us on "60 minutes" in 2006. >> it's a long way from where we walked last time. >> reporter: she says her journey from rwanda to america was more complicated than just getting on a plane. >> the key it was let go of the anger. anger was so heavy on me. it was a lot of hate. >> reporter: but how do you let go of it? >> when i was like, "god, i just wish i remember how to smile again, i'm a monster." >> reporter: she had already begun smiling when we strolled with her 7 years ago along rwanda's green and lovely hills. but the images of what once happened there are still with her and will never go away.

>> i remember i came up to the hill and i saw somebody with a machete actually cutting somebody. >> reporter: it was more than a decade since the massacre and she was finally ready to describe how she and six others survived with the help of a hutu minister. >> so when he took us in the bathroom, i was like, oh, my god, i will be saved here. this bathroom is hidden that we will be saved. >> reporter: they spent three months there and would have stayed longer but french troops had finally arrived and set up a camp a few miles away. she now lives in new york with her two children. she travels the world giving inspirational talks on forgiveness. >> there's no better protection than truly coming back to the core values. >> reporter: twice a year she takes americans to rwanda to the scenes of the massacre. how do you explain what happened in rwanda? do you understand anything? >> it's pure hatred. it's really pure hatred. when you start to see another human being as less than you, it's a danger.

>> and i take this obligation freely -- >> reporter: but she is out of there now. >> without any mental reservation. >> reporter: not only that, look where she led. >> or purpose of evasion -- so help me god. i feel like i'm in a place i was supposed to be in. >> congratulations to all of you new citizens. >> it's beautiful. i love it. [ applause ] >> reporter: from rwanda to new york, from hate to love, a pretty good trip. bob simon, cbs news, new york. >> and that's the "cbs evening news" on a very busy news day. for all of us at cbs news all around the world, good night. captioning sponsored by cbs captioned by media access group at wgbh access.wgbh.org captioned by media access group at wgbh access.wgbh.org

>> your realtime captioner: linda marie macdonald it's been a day of fast paced developments in the boston marathon bombings investigation in some cases too fast. good evening, i'm juliette goodrich in for elizabeth cook. >> i'm allen martin. the fbi is adamantly denying earlier reports of an arrest in the case. however, they may be closer than ever. cbs news has confirmed that a suspect has been identified in surveillance video. in it, he appears to be dropping off a black bag that may have contained the second bomb. investigators say the man was on his cell phone when the first bomb went off. he was then seen quickly leaving the area. investigators won't say how close they are to tracking him down but claim major progress. we have live team coverage starting with ken bastida in

boston. we are starting to see signs of people's lives slowly returning to normal. >> reporter: yeah. that's right, allen. they are taking, you know, the developments today as good news here in boston. somewhat. the investigation is moving forward and people are feeling better about being outside. in particular, merchants have had a chance to get back to work. >> reporter: words spread quickly around copley square that something was going on a suspect in the bombing has been identifyed. >> seeing this news on the tv now means a lot to us to my customers and to my partners, you know. the whole area has just been -- yesterday you couldn't walk down here. i couldn't walk to my own restaurant. it was a crime scene. >> reporter: tony is one of the lucky ones. much of boylston street is a crime scene. at least he is back in business. he had to force his customers out when the blast hit. >> we ha