he had boris nemtsov murdered in the shadow of the kremlin. >> this is personal insult.reporter: that is putin's top aide and spokesman, dmitry p petsov. >> it's nonsense, it's nonsense. there's nothing to comment on. >> reporter: over the course of putin's time in power, his regime has been accused of involvement in the deaths of many of its critics, including the journalist anna politkovskaya and a former kgb agent. >> there's not a shred of evidence. there's not a single thing to sustain these allegations, but they take on a kind of folklorish reality. >> reporter: the allegations that putin might have played a role in boris nemtsov's murder may stem in part from the evidence that nemtsov had been accumulating against the president. >> nemtsov was about to reveal information that would prove russia's involvement in the conflict in ukraine. >> reporter: that ukraine report was released a few months after nemtsov's murder. but there was an earlier nemtsov report published in 2012 that also was embarrassing for putin. it claimed the president had 43 planes, 15 helicopter

on boris nemtsov, the man shot dead on the bridge. he was touring the country promoting this documentary going from lecture to lecture. you've been on book tours, you know what it's like when you go from location to location. he was in a very hectic period and sometime during that period his doctor says he was given some sort of poison. he doesn't know when, he doesn't know where but he was promoting this documentary on another activist, a friend of his who's the godfather to one of his children and then in the middle of the morning, 4:30, 5:00 a.m. he says, he suddenly feel this is incredible pain, he shoots up out of bed, he can't breathe and within 15, 20 minutes, he can't even stand and his organs start collapsing. so look at the pattern. his friend was shot dead. he was poisoned some time while he's promoting a documentary about his friend. other activists in his circle have end up killed or injured so in his claim that there's a pattern that if you speak out against the kremlin bad things will happen to you, there is a case to b

inside the circle of what a russian tv station claims is boris nemtsov and his girlfriend.ho led the protests in 2011. while this snowplow hides the two from camera's view, nemtsov was killed, shot four times in the back. >> a prominent russian opposition figure has been killed. >> four shots, in the back. >> just blocks from the kremlin. >> so who murdered boris nemtsov? vladimir putin condemned the killing, calling it shameful and imp impudant. in the meantime, doubts remain. >> the assassination was extremely professional. >> reporter: a russian-born journalist says that only one group could be that professional. >> his girlfriend he was walking with didn't realize he had been shot until the car was driving off. it was quick and professional, and nobody has that kind of training outside the government. >> senator john mccain takes it one step further. >> vladimir putin is a thug and a murderer and killer. and a kgb agent. he had boris nemtsov killed in the shadow of the kremlin. >> this is allowable behavior. >> it's nonsense, it's nonsense. there's nothing to comment on

he had boris nemtsov murdered in the shadow of the kremlin. >> this is personal insult.onsense. there's nothing to comment on. >> over the course of putin's time in power, his regime has been accused of involvement in the deaths of many of its critics, including the journalist ana pollit kof skyia, and a former kgb agent. >> there's not a shred of evidence. there's not a single thing to sustain these allegations, but they take on a kind of folklorish reality. >> it may stem in part from the evidence that nemtsov had been accumulating against the president. >> nemtsov was about to reveal information that would prove russia's involvement in the conflict in ukraine. >> that ukraine report was released a few months after nemtsov's murder. but there was an earlier nemtsov report published in 2012 that also was embarrassing for putin. it claimed the president had 43 planes, 15 helicopters and four yachts at his disposal. including one super yacht. then there are the palaces. nemtsov's report says there were 20 presidential palaces available to putin at any time. one of the pal

he had boris nemtsov murdered in the shadow of the kremlin. >> this is personal insult.son. >> it's nonsense, it's nonsense. there's nothing to comment on. >> over the course of putin's time in power, his regime has been accused of involvement in the deaths of many of its critics, including the journalist anna politkovskaya, and a former kgb agent. >> there's not a shred of evidence. there's not a single thing to sustain these allegations, but they take on a kind of folklorish reality. >> it may stem in part from the evidence that nemtsov had been accumulating against the president. >> nemtsov was about to reveal information that would prove russia's involvement in the conflict in ukraine. >> that ukraine report was released a few months after nemtsov's murder. but there was an earlier nemtsov report published in 2012 that also was embarrassing for putin. it claimed the president had 43 planes, 15 helicopters and four yachts at his disposal. including one super yacht. then there are the palaces. nemtsov's report says there were 20 presidential palaces available to putin

inside the circle of what a russian tv station claims is boris nemtsov and his girlfriend.ts in 2011. while this snowplow hides the two from camera's view, nemtsov was killed, shot four times in the back. >> a prominent russian opposition figure has been killed. >> four shots, in the back. >> just blocks from the kremlin. >> so who murdered boris nemtsov? vladimir putin condemned the killing, calling it shameful and impudent. in the meantime, doubts remain. >> the assassination was extremely professional. >> reporter: a russian-born journalist says that only one group could be that professional. >> his girlfriend he was walking with didn't realize he had been shot until the car was driving off. it was quick and professional, and nobody has that kind of training outside the government. >> senator john mccain takes it one step further. >> vladimir putin is a thug and a murderer and killer. and a kgb agent. he had boris nemtsov killed in the shadow of the kremlin. >> this is lousy behavior. >> it's nonsense, it's nonsense. there's nothing to comment on. >> over the course of p

vladimir is vice chair of open russian movement and also chairman of the boris nemtsov foundation for freedom, and we are very honored that he is able to be here with us today. i also like to recognize his wife who also is here, it was also truly a person of courage as well in this fight. so without further ado please join in a very vigorous applause for these very three distinguished speakers. senator cardin. [applause] >> mattapan bassett are, first of thank you very much for the very generous and kind introduction. -- madam ambassador. particularly to be with my colleague and friend, senator rubio. one of the real great leaders in the united states senate on so many issues but today on human rights. there's not a greater champion. i served with him on the senate foreign relations committee and i must tell you i'm so proud to serve on the committee with him. he raises to everyone who comes before us that the critical questions on support for basic human rights senator rubio, it's a pleasure to be with you as always, and thank you for your chairmanship on these issues. but to my frie

>> reporter: russian opposition leader, boris nemtsov, told me there 2014 that critics of putin counted on the u.s. to help them stand up to the russian president. >> everybody who is against him must be very careful. be afraid every minute. it's completely impossible for me. >> reporter: one year after that interview is, nemtsov was dead, shot down under heavily guarded moscow bridge near the kremlin. brian ross, abc news. >> there was another critic recently in a coma, and he has recovered and he's going to be testifying in congress come next week. >> very important testimony. >> brave man. >> very brave. coming up, switching gears, she's best known for her roles on married with children" and sons of anarchy but xwt roaded to stardom has been a bumpy one pore katey sagal. >> struggles. we'll talk about it. without any harsh chemical residue. lysol. what it takes to protect. clearasil rapid action begins working fast for clearly visible results in as little as 12 hours. but can it fix this teen's skateboarding mishap? nope. so let's be clear: clearasil works fast on teen

boris nemtsov was a very close friend of mine. many other opponents are in prison. many have been driven into exile. i'm a human being. of course it's disconcerting to say the least. at the same time, i believe that what we do is important, and i think frankly, you know, if we care about our country, which we do very much, we have to do what we can to make sure that it has a better future and that its citizens and especially its young generation, those people who we saw coming out in the tens of thousands to the streets of russia that past weekend have a future and have prospects and have a future in a democratic russia based on rule of law. so we will continue our work to the extent that we can. >> all right. vladimir car amur za, thank you very much. >> thank you. >>> we finally learn the fate of two major players in the bridgegate scandal today. bill baroni, former ally of governor chris christie of the port authority along with bridget kelly, the former deputy chief of staff, were both handed prison sentences today. kelly receiving 18 months. baroni, two years.

boris nemtsov was shot right next to the kremlin. none of them survived. >> do you think this is what campaign organized by the kremlin. >> there seems to be a an extremely high mortality rate of among independent journalists and political opponents of vladimir putin. >> reporter: his message for president trump? >> the only thing we ask of our colleagues and western leaders, including the united states, is that they don't help mr. putin. >> reporter: we've reached out to the kremlin to the russian embassy, and to russian police for response, so far, nothing. samples of kara-murza's hair, blood and fingernails have been sent to labs in the three countries, including here in the u.s. to try to determine which poison was used. >>> richard, thank you. tonight, the newly released dash cam video that's raising questions about the death of a georgia teenager. sheriffs deputies in harris county pursued the 18-year-old for ten miles before he was finally stopped. but it's the arrest and subsequent death that has many asking questions. and hi

two years ago, boris nemtsov, a prominent politician, gunned down near the kremlin. and in 2006, alexander l lit v litvinenko was poisoned. his murderer was carrying a passport, but people say russia ordered the hit to silence him. a spokesman for putin says he hopes that an ukrainian investigator is able to solve the murder, and mr. putin invited the victim's widow to return to russia. >> we'll see if they accepts that invitation. thanks so much. >>> now to the u.s. military tonight admitting it launched an air strike in iraq that killed scores of civilians. the u.s. saying iraqi security forces requested the air strike mosul on march 17th, and they did not confirm casualty numbers, but health workers say at least 100 people were killed. >>> we're learning more about the final moments of the man accused in the horrific attack in london. details coming out with ties to saudi arabia, and questions intensifying on whether he worked alone. abc's jennifer eccleston with the latest from our london bureau. >> reporter: new video of the attacker moments after his deadly ram

>> reporter: russian opposition leader, boris nemtsov, told me there 2014 that critics of putin counted on the u.s. to help them stand up to the russian president. >> everybody who is against him must be very careful. be afraid every minute. it's completely impossible for me. >> reporter: one year after that interview, he was dead. shot down under heavily guarded moscow bridge near the kremlin. brian ross, abc news. >> we thank brian for that report. >>> next, an arrest in israel. a teenager with dual israeli-american citizenship is in custody accused of phoning in threats that forced evacuations of dozens of jewish community centers and schools across the u.s. and elsewhere. the suspect is jewish and was rejected by the israeli army facing questions about his mental health, but his motive is still unclear. >>> back here at home in new york city, an army veteran who police say is an admitted white supremacist has been charged with murder as a hate crime in the stabbing death of a black man he apparently chose at random. prosecutors say he told police that attack was only the beginning.

one of them was boris nemtsov, a leader of russia's opposition and kara-murza's partner in lobbying formagnitsky act. >> vladimir kara-murza: on the 27th of february 2015, he was killed by five bullets in the back as he was walking home, as he always did, out in the open, without bodyguards-- >> stahl: this was an assassination. in some of the deaths, proving there was foul play has been a challenge. take the case of this russian banker, who came forward with incriminating documents related to the magnitsky case. >> browder: alexander perepilichny was a whistleblower. at the age of 44, he went jogging outside his home in surrey, outside of london and dropped dead. the police deemed it an unsuspicious, natural death. >> stahl: well, they did look for poison. they just couldn't find any. >> browder: they did a very first-round toxicology screen. they didn't find anything on the first run through. >> stahl: detecting poison can be extremely difficult, and there's a reason: this cold war c.i.a. memo reveals that the soviets ran a "laboratory for poisons in a large and super secret installat

boris nemtsov was shot in an elevator. reporter: his message for president trump? >> the only thing we ask of our colleagues and our political leaders in western democracies including the united states is that they don't help mr. putin. >> nbc news reached out to the kremlin. russian embassy and russian police for a response. so far, there hasn't been one. samples of kara-murza's hair, blood and fingernails were sent to labs in three countries including the u.s. to try to determine which poison was used. >>> the list of people in trump's campaign that had contact with russian ambassador sergey kislyak is growing and now looks like at least six had some kind of contact with him before and after the campaign. the question is, was this just normal and accepted contact for a presidential campaign? or was there more going on? dr. andrew kuggins, he conducts research and writes on russian foreign and domestic policy. thank you very much for joining me. >> my pleasure to be here. >> first, explain russia's motivation and getting

right up until boris nemtsov was killed outside the kremlin, his friend alexei navalny had been leaflettingim for a march they were due to lead against bird flu tin in moscow together.

particularly given my involvement, together with the late boris nemtsov, the leader of the russian oppositionrt of the magnitsky act, act being passed in the united states. 0k. we'll. .. i think that is probably the most likely... you talk about how you put two and two together. the difficulty here is that there doesn't seem to be any substantial evidence. even your own father was quoted, both in the new york times and in the russian paper as saying he doesn't believe you were poisoned. fie—wee thaéssfeaésafmss is —— — — —— i don't think so either. if someone really intended to kill him they wouldn't have allowed him to be driven to intensive care. well, in terms of my father, we have to be careful with quoting here. years, ithink, you know, maybe, you're not going to be in a very stable and adequate state when you are doing these comments. he said it on day one when he didn't have any more specific information. if you look at what he said later on, it would be very different, and of course my wife and my lawyer was speaking on my behalf during this latest poisoning and they said it very clea