g has been a paid advertisement for the 21 day fix, brought to you by beachbody. they're among the most sensational stories of our time. sometimes very personal person of interest. >> reporter: tonight -- >> he said -- >> he was once a kgb agent but turn speed a invokeed into a invoke at cittic of russia. >> why was he killed? to unravel the mystery, we followed the tale of a dark

conspiracy that may not be over. >> are you threatened for your life? >> we'll meet and confront the prime suspect -- did you put palonium in the tea? is danger coming closer? >> two men in the bushes, one said "shoot him." >> an attack on the expert helping with the story. >> people say, oh, it's never going to happen here. i know it can happen here because it happened to my husband. ♪ >> "dateline: the real blacklist." >> good evening, this is a fortress in the city of the city. for hundreds of years, this has been the seat of power and a center of intrigue. tonight, we'll examine the case of a former russian agent named alexander litvenenko. exactly what happened and why had been mysteries for a long time. now there are new leads. he lived in a world of spies and dissidents where everyone was playing a game and where access

to information could make you a very rich man or a dead one. >> a former russian agent poisoned. a multimillionaire found dead in his bathroom. investigative reporter executed in front of her home. their lives had been interconnected interconnected, but what about their deaths? random act or as some suspect, part of an international murder conspiracy that stretches across two continents and several world capitals? tonight, we'll investigate who wanted them dead and why. the case will take us from moscow to rome to london into a world of spies and spy hoof

catch -- spy-catchers and a world in which murder happens often. was there a hit list in find? >> i'm sure there was. >> reporter: our story begins closer to home. o a a late winter evening, paul doyle, an intelligence analyst, was driving to his house outside of washington, d.c.,. it was quiet and dark. >> i got out of my car, there were two men waiting in the bushes. they jumped me. one man i fought with and we ended up on the ground in a tussle. and this one man said to someone else i didn't see, "shoot him." so i covered my heart with my arms, i turned to the side. [ gunshot ] >> and a shot went through me. >> reporter: one shot? >> one shot, and then i regard the click. >> reporter: another click? >> right. and nothing happened.

>> reporter: you're shot once. >> right. >> reporter: you're rolling to protect yourself. >> right. i hear a chamber to clear it, gun jammed. at that point in time the lights went on in my house. >> reporter: joyal's wife, elizabeth, heard the commotion. >> all of a sudden i hear a shot. that flipped me out. i knew it was a gunshot, i knew it was a gunshot and i knew it was close. >> reporter: she opened the door and saw her husband. >> he's wearing a raincoat, a suit a hat, and he's doubled over, and you can see that he's in pain, and he look at me and says, "i've been shot." >> reporter: the assailants had fled. elizabeth got joyal inside and called 911. >> as soon as that 911 call was done asked my son to lift my legs up because i wanted to make sure that most of, you know the blood was -- >> reporter: stays in the body. >> stays in the body. >> reporter: so you don't lose consciousness.

elizabeth is a registered nurse. her training kicked in. >> there was no sign of external bleeding at that point, so that kind of freaked me out, too. as a nurse, i know if it's not bleeding on the outside, it's bleeding on the inside. [ siren ] >> reporter: an ambulance arrived and rushed joyal to the hospital. the .9-millimeter bullet had torn through his bladder and intestines. they had to place him in a drug-induced coma to save his life. he was unconscious for a month. local law enforcement initially assumed the shooting was a botched robbery, but elizabeth joyal believed otherwise. >> i didn't want to seem like this crazy conspiracy theory woman, but i knew that, you know, it was not a carjacking. it just -- there is just no way that it was just some random guy. it had to have been a planned attack.

>> reporter: because nothing was stolen and the assailants had clearly been lying in wait. which is why, when joyal came stumbling into the house with a bullet wound, he told his wife to call his business partner, a former russian spymaster. >> and warn him i was shot. >> reporter: so if you're warning your russian business partner that you've been shot, you clearly didn't think this was a botched robbery, car jacking. you thought this was related to your work, related to your russian connections. >> well, i don't think there's any doubt. >> someone had tried to kill him, just like the other guy in -- in london. >> reporter: the other guy? a former kgb agent, and friend of joyal's, killed three months earlier in london. assassinated with a weapon so frightening and exotic investigators almost missed it. a weapon that raised the specter of state-sponsored murder.

coming up -- we trace the steps of a mysterious attack from bus to bar to deathbed. >> he was going through unspeakable torment. >> where scotland yard can only help the victim will live long enough to help solve his own murder. >> he's fighting for his life. >> "dateline" continues. ♪i leave a story untold... ♪ he just keeps sending more pictures... if you're a free-range chicken you roam free. it's what you do. if you want to save fifteen percent or more on car insurance you switch to geico. it's what you do. ♪ two wheels a turnin'... ♪ ♪ discover new magnum double peanut butter. made with a perfect balance of peanut butter ice cream peanut buttery sauce and belgian chocolate. discover magnum chocolate pleasure.

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we don't know why and who was been it. paul joyal barely recovered from his shooting. he traveled with us to london to tell us what happened to an important contact of his just a few months before joyal was shot. >> it was a law enforcement officer. >> worked for the equivalent of the fbi? >> yeah. >> in anti-corruption? >> anti-corruption is what really he was most interested in. >> his name was leak litvinenko sasha to his friends. but his interest in fighting corruption had made him a lot of enemies including in his own agency the kgb, which was renamed the fsp.

litvinenko was forced to flee russia with his wife and son and seek asylum in london where he quickly caught the attention of agents of the british intelligence service mi6. glen moore trainer harvey was a retired and charming mi6 analyst who was asked to befriend litvininko. the british wanted find out what he knew about his former colleagues in the russian secret services. >> it was of great interest for us to know who these people were. so naturally, he was debriefed to talk about any of his russian contacts that came in. >> was he incredible single in. >> yes he -- credible? >> yes he was. >> credible enough that mi6 began paying him a monthly salary. trading information for money of one way for a former russian eighth to make a living in his new home in london. suddenly in 2006 -- [ siren ] >> -- litvinenko, who had always

been fit and healthy, got very sick. >> it was just incredibly strong and heavy sickness just suddenly and not stopping. >> litvinenko's wife, marina watched him waste away in a matter of just days. >> it was awful. his hair started to be -- >> to fall out? >> yes, and he started to look like cancer patient treated by chemotherapy. >> i knew he was going through unspeakable torment. >> finally they found, in his blood. he might be have -- uh, be

poisoned. >> reporter: poisoned. doctors suspected maybe he'd injected thallium, commonly found in rat poison, and treatable with an antidote. >> finally. finally, we know what happened to sasha. and now we all under control and he will be safe. >> reporter: but it wasn't under control. the antidote didn't work. litenvenko didn't get better. he got worse. before long, even close friends, like andrei nerasov, who directed a documentary about litvinenko, which included this rare footage, could barely recognize him. >> at some point, i said to myself, why should this be happening to this young, healthy handsome athletic man? what's going on? >> he's fighting for his life. >> reporter: a fight litvinvenko would lose. >> we're sorry to announce that alexander litvinenko died at university college hospital at 9:21 on the 23rd of november, 2006.

>> reporter: but in the days just before his death, litvinenko did something remarkable. he knew he was dying and decided to help scotland yard detectives solve his murder. he gave them a series of deathbed interviews. the transcripts provide a remarkably detailed account of his movements on the day he was poisoned. litvinenko's account starts at 10:00 a.m. when he received a phone call from an italian contact, mario scaramella, who'd just arrived in london and insisted he needed to meet litvinenko immediately. he said he had urgent news. they agreed to meet that afternoon. at 12:29, litvinenko caught this bus to the east finchley station. from there, he caught a subway to central london. >> this is the statue of eros in piccadilly circus. it's a london landmark and this is where litvinenko met scaramella. litvinenko liked to meet all of his contacts here. it's a wide open area with many entrances and exits and he would sit back and watch to see if

people were being followed. >> reporter: at 3:10 p.m., litvinenko and scaramella were spotted on a security camera walking west on piccadilly street. they came to this sushi restaurant where litvinenko ate lunch. scaramella said he wasn't hungry. litvinenko and scaramella parted ways after lunch. at 3:48 p.m., litvinenko was caught on another security camera talking on his cell phone. >> litvinenko then walked about a mile to the millennium hotel, which is literally right across the street from the u.s. embassy. it's that modern looking building over there. this is one of the most secure neighborhoods in all of london. >> reporter: one of the hotel's security cameras recorded litvinenko arriving in the lobby at 3:59 p.m. he was there to meet andrei lugovoy, another former

fsb agent, seen here wearing a black leather jacket. lugovoy had his own security consulting firm. he and litvinenko had been talking about doing some business together in london. the two had met several times over the past year. this time lugovoy brought along a buddy, a man named dimitry kovtun. he's the one in the black turtleneck. it was a quick meeting. litvinenko drank just half a cup of tea then left. around 5:00 p.m., he caught a ride home. that night, he fell ill. and three weeks later, he was dead. so, who so slipped litvinenko poison that day, putting his murder into motion? litvinenko told scotland yard detectives before he died he didn't know when or who had poisoned him. but he had no doubt that one or more of the men he met that day. the two russians or the italian was his killer. naturally, we wanted to talk to all three.

coming up we track down the first suspect named. are you frightened for

alexander litvenenko, the former russian agent, the man friends called sasha, died without knowing what killed him. the results from a battery of tests came in too late. but they did come in. it turned out he was killed by something far more lethal than common rat poison. >> it's polonium! >> reporter: polonium 210 to be exact, a rare and deadly

radioactive isotope. the news shocked the world, even though most people weren't exactly sure what polonium was. but paul joyal knew what it was and what it could do. that his friend effectively burned to death from radioactivity. >> it's a horrible death. it's a gruesome death. >> he lived longer than he -- than any man normally would under those circumstances. and he lived just long enough, within 12 hours long enough, for them to finally determine that it was polonium versus something else. >> why if he had died 12 hours earlier, would it have made any difference? >> because they wouldn't have found out. they would have marked the death certificate as "death unknown." he would have been put in the ground and it would have been just a mystery. unknown -- unknown assailants. turn the page, move on. >> it's the key of this murder. polonium 210 was discovered and

now we exactly -- sasha was killed by polonium 210. >> reporter: it's an almost perfect murder weapon. polonium has no smell, little taste, and without specialized equipment, it's undetectable. >> if you not looking particularly for polonium, you not able to discover it. do you know? it will be everywhere, but you don't know this. >> reporter: the amount that killed litvinenko, slipped into something he ate or drank, was no larger than a grain of salt. but that's still a thousand times the lethal dose. and that tiny bit of polonium would have been enormously expensive. >> eight to $12 million to be able to get the portion that went into him. >> reporter: but who could get a hold of such an expensive and exotic weapon? and just how did they deliver the fatal dose? when detectives went step by step with litvinenko through the day he was poisoned, he named three potential suspects -- the

two russians and the italian. the first one we found was the italian. so now in rome we're on our way to see mario scaramella, who hopefully can shed some more light on who killed alexander litvinenko and why. scaramella has been a hard man to pin down. first, he wanted to meet us in naples, then new york, then london. he finally agreed on rome and we're about to find out why he's been so skittish. [ speaking italian ] >> reporter: how to describe scaramella? he's a lawyer, an academic, a security analyst and also someone litvinenko never completely trusted. scaramella, you'll remember, is the contact litvinenko met at the sushi bar on the day he was poisoned. >> litvinenko thought you poisoned him? >> yes. >> you didn't poison him? >> absolutely not. >> from his perspective, it does make sense. >> uh-huh.

no, sure, everything is very strange. >> reporter: scaramella had been working for the italian government and sometimes used litvineko as a source for an investigation into russian mob and spy rings. >> so, he was giving you names of russian mafia members -- >> yes, names, dates. >> who were connected to the intelligence service? >> exactly. >> reporter: something that was sure to upset both the mobsters and the fsb. scaramella told us that in october 2006, the month before litvinenko was poisoned, he began receiving frightening emails. the final message arrived on the very day of his last meeting with litvinenko. and what did that message say? >> look there are people ready to kill you. >> the emails amounted to a hit list. the next name up -- >> alexander. >> alexander as in litvinenko. scaramella says that's why he met with litvinenko in london, to tell him about the hit list, to warn him. but, he says, litvinenko didn't

buy it. >> he said, "mario, don't care about that." >> he says, "it's b.s."? >> i think it's just a provocation, but please check what's happening. >> but after what happened to litvinenko, scaramella says he takes the hit list seriously. are you frightened for your life? >> well -- do you have another question? >> scotland yard questioned scaramella and eventually cleared him. why? because if you're looking for it, polonium is traceable. using specialized equipment, investigators were able to track it in people and places. >> once polonium 210 had been identified, then across europe, like the slime from a slug all the way across, polonium was popping up everywhere. >> reporter: but not in scaramella. no polonium in his body or anywhere he'd been. so, scotland yard took a hard

look at the two russians, lugovoy and kovtun. when detectives retraced their steps, they found polonium contamination everywhere. >> we see the same fingerprints of the polonium in multiple places where they were. >> reporter: business offices, hotels, a hookah bar, a strip club, a soccer stadium. and the millennium hotel's pine bar where they last met litvinenko? that's were investigators hit the jackpot. these 3d graphics, put together by scotland yard, show the entire pine bar was contaminated with polonium, with extreme hot spots on a table and chair. and the levels found inside this teapot? off the charts. paul joyal wonders how many people were unwittingly exposed. >> do we know, ultimately, what the final cost of this use of polonium is? someone who was washing dishes

in the pine bar or in a hotel, cleaning crew, do we know, ultimately? >> reporter: five months after litvinenko's death, scotland yard issued an arrest warrant for lugovoy. kovtun's would come later. the two responded with a press conference in moscow stating their innocence. [ speaking russian ] >> reporter: russia refuses to extradite them, so we travelled to moscow to find the men who are now officially wanted in connection with litvinenko's murder. coming up -- the stakes get even higher as we confront a cop russian official. he had been speaking out aggressively against russian officials for years. how is it that all of this evidence doesn't point to russia? (children laughing) he's so cute! what should we name him? (gasps) can we keep him? -please?

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winter, 2015 we arrived in moscow in an effort to find out not only who killed former russian agent alexander litvinenko but why. this is home to andrei lugovoy and dimitry kovtun, hunted by both scotland yard and interpol, suspected of killing litvinenko. around the world, they are the villains in a tale of international intrigue and murder. yet here in russia, we found plenty of people who thought if the two did kill litvinenko, he probably had it coming. thank you very much for talking to us. in the duma, russia's parliament, the pugnacious leader of the ultra-nationalist party has nothing but disdain for litvinenko.

>> translator: who needs this little petty person? he was just a piece of rubbish. >> reporter: vladimir zhirinovsky told us that here in russia litvinenko made plenty of enemies going back years. back in the 1990s, russia was in chaos after the collapse of the soviet union. it was a time when enormous fortunes were created and outrageous crimes committed, sometimes by the very people sent to investigate them. back then, alexander litvinenko was a young fsb agent who claimed to be disturbed by what he saw. >> reporter: litvinenko specialized in organized crime investigations, but became obsessed with what he believed to be corruption within the fsb, crimes committed by the cops. he compiled a dossier, complete with flow charts, detailing his allegations and presented it personally to the head of the agency. >> and the result was? >> opposite. >> surveillance on your family. >> exactly. >> reporter: an outraged litvinenko now did the

unthinkable, he led a nationally televised press conference. a group of agents, several of them in disguise, claiming the fsb had become corrupted by russian mafia money. >> not only was it absolutely extraordinary, but as you see from the picture of that news conference, he did not have a mask. >> reporter: litvinenko even claimed he'd been ordered to assassinate a prominent billionaire, boris berezofsky, but instead warned him that his life was in danger. >> the essential motivation of this very simple man was his feeling that his country was being betrayed by the leadership. >> he believed he didn't do anything wrong. he was a good officer. >> he didn't think it would get him in trouble? >> he said they will kill me or they will arrest me. >> reporter: he was jailed for nine months. but that billionaire he'd

warned, berezofsky, bailed him out and helped litvinenko and his family flee to london. there, litvinenko kept up the drumbeat of criticism against the russian government. he even wrote a book accusing the fsb of starting a war in chechnya for political reasons. in response, russia branded litvinenko a traitor. his image used for target practice by russian special forces. this wasn't just symbolism. in march 2006, eight months before litvinenko's murder, the russian parliament passed a law authorizing the liquidation of enemies of the state anywhere in the world. >> you don't pass that just for the sake of passing it. you have to have somebody in mind. >> reporter: seven months later, someone was liquidated, a prominent russian journalist, shot in the head outside her moscow apartment.

she was a friend of litvinenko. three weeks later, litvinenko was poisoned with polonium 210. duma leader zhirinovsky certainly didn't shed any tears when that happened but laughs off the notion that the russian state was connected in any way. for one simple reason -- he thinks russian agents would have done a better job. >> i'm surprised that the uk special services and the uk court accuses russia and lugovoi that with a bag of polonium they came to london and were just throwing it around. >> it just doesn't make sense to a lot of people that russia didn't kill him. >> translator: for a hundred years, the russian special services have been using the kind of substances for killing people that you never will be able to recognize. why do we have to go into some kind of a bar and put it in somebody's tea cup and everybody's laughing at it? i mean, the state cannot be involved in that. >> reporter: litvinenko's friend paul joyal, who believes he was the target of a botched assassination, agrees that in

some ways litvinenko's killers were indeed clumsy and careless. but he says that's because they were probably just pawns in a much bigger game. >> do you think that any of them knew what that -- what that substance was? do you think that they knew they were handling polonium? >> why wouldn't they have known what they were handling? >> because you don't want them to know. >> but they could have done a better job not spreading it all over the place, if they knew. they also -- they also might say no, there's no way i'm going to do that. >> i don't want to handle this radioactive material. >> i am not going to kill myself in the process. >> reporter: to get closer to the truth about who killed litvinenko, we had to talk to the suspects themselves, andrei lugovoy and dimitry kovtun. in kovtun's case, it wasn't easy. a few weeks after litvinenko died of polonium poisoning, kovtun was hospitalized and lost all his hair. he hasn't been seen publicly in three years.

that left lugovoy. when we got here, he didn't want to speak with us. but on the second day of our trip he called and said he was ready to talk. coming up, at last we lay eyes on one of the men believed to have killed litvinenko. now we ask the question the world wants answered -- did you put polonium in the tea? ugh. does your carpet ever feel rough and dirty? don't avoid it. resolve it. our new formula with a special conditioning ingredient softens your carpet with every use. because it's resolve, you know it cleans and freshens, but now it also softens. so your carpet is always inviting. resolve. a carpet that welcomes you.

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>> reporter: meet andrei lugovoi. handsome, dapper, urbane. and one of the men scotland yard believes conspired to poison former russian agent alexander litvinenko. we'd been negotiating an interview for weeks. he agreed, then backed out, then finally sat down with us. what did you think of litvinenko? were you friendly? would you consider yourselves friends? >> translator: i have always said that we have never been friends. he was a very complicated person, slightly crazy i would say. he was given to conspiracy theories, to blowing things up out of all proportion. >> reporter: he and litvinenko both used to work for the fsb. both had served time in jail. it was a bond between them. lugovoi had done very well in business after that and opened a

security consulting firm. he says he and litvinenko met several times in london to discuss doing business there together. including that now infamous meeting in the pine bar where scotland yard says litvinenko was poisoned. lugovoi says the meeting was no big deal. >> so, what do you remember about sitting there at the table? >> i remember that we talked with litvinenko about nothing in particular. and now for eight years, i am under suspicion. >> you're under suspicion because the investigation says there was polonium in that teapot. did you put any polonium in the tea? >> translator: of course not. i was tested for polonium, and i tested positive. did i put polonium into myself? am i an idiot? am i crazy? >> reporter: but scotland yard detectives don't believe lugovoi's denials. in fact, they think he tried kill litvinenko more than once. that's because they found polonium on the table in a conference room where he and litvinenko had met two weeks before the pine bar encounter.

>> was anything spilled on the table? >> translator: richard you are asking questions -- i remember some things, i don't remember other things. i cannot answer these questions because these can be used against me in the court, which is done frequently. >> reporter: as for his last meeting with litvinenko at the pine bar, lugovoi says there's no way he brought polonium on that trip because his wife and children were with him. >> a person's weakest spot is his family. and i'm a rational man. even if i had taken part in an operation, even if i had known what was in the container, would i take my family along? i am a rational man. i couldn't do it. >> reporter: not only did he continue to maintain his innocence, he offered his own theory about who poisoned the tea. >> could someone have put something in there without you noticing?

>> translator: no. why don't you think that the polonium may have been put there into the cup after our meeting the next day or by a guy from mi6? he brings the polonium and pours it into the cup. that's agatha christie stuff. >> reporter: mi6 is british intelligence. lugovoi says perhaps the brits killed litvinenko to embarrass russia. retired mi6 analyst glenmore trenear-harvey says that's nonsense if for no other reason because mi6 would never use such an expensive weapon to kill anyone. >> if the british wanted to kill him, then he would have fallen out of a hotel window. he would have been placed in front of a car. we'd have spent $12 million in a slightly more cost-effective fashion. >> you would have made it look like an accident? >> indeed. things are done less expensively, more cost effectively. old fashioned bullets in bodies work rather effectively and quite cheaply. >> why not just shoot him? >> i didn't say they would have done. they could possibly.

we -- >> could possibly have done -- >> we -- we don't do that sort of thing. >> reporter: also remember, litvinenko was working for mi6 and it was lugovoi and his partner dimtry kovtun who left a radioactive trail all over london especially at the pine bar. lugovoi is hardly hiding here in russia. he did our interview in one of the restaurants that he owns, he's a member of parliament and he's even become something of a pop culture icon hosting his own tv show. the program appropriately enough, is called "traitors." it names and shames individuals who are supposedly enemies of the russian state. lugovoi's high profile here is just one reason that many people who suspect him of murder don't think he acted on his own. another reason all of the polonium 210 in russia is under the control of the state. >> it's impossible to use a state-controlled substance like

this without the knowledge of the very top of the country. >> because you're unleashing a radioactive substance? it's almost -- it's a tiny, little dirty bomb -- >> it's -- nuclear terrorism. coming up where does this trail really lead? of all his enemies, litvinenko may have infuriated one more than any other. >> i said this is a very dangerous thing to do because you're personalizing this.

>> reporter: while in london we had a hastily arranged meeting with another man who's convinced his life is in danger. akhmed zakayev is a wanted man in russia, a rebel leader from the breakaway chechen republic. and a close friend of the former

k.g.b. agent, alexander litvinenko who he says gave him an important piece of advice never trust old friends. >> he said, "someone will come from your past. but you shouldn't trust him because he will be your killer." >> reporter: sasha told you that? >> sasha told me. >> reporter: beware of someone coming? >> beware of someone from your -- >> reporter: -- from your past? >> -- past. >> reporter: which may be what happened to litvinenko, after all andrei lugovoi was a person from "his" past. but as we've seen, there were a number of people in litvinenko's past who may have wanted him dead, the f.s.b. colleagues he denounced, the russian mobsters he was investigating, perhaps someone who thought he was a traitor for working with british intelligence. for eight years now litvinenko's widow marina has been asking, "how big was the conspiracy? who was behind it? how high did it go?" dangerous questions, as she knows better than anyone. >> you think you play chess.

but they play russian roulette. >> reporter: those who were closest to litvinenko believe the kill order may have come from the very top because litvinenko picked a fight with the wrong person from his past. none other than russian president vladimir putin. >> sasha was on a mission. he was trying to prove that putin is as corrupt as anybody in post communist russia. >> reporter: the mission may have started years before when litvinenko made that flow chart of corruption in the f.s.b. the head of the agency at the time was putin. after litvinenko fled to london, and putin became president of russia, litvinenko attacked him relentlessly, and by name. >> i and others said that this is a very dangerous thing to do because you're -- you're personalizing this. >> reporter: you told him that? >> yes. >> reporter: but marina and others believe the ultimate motive may not have been

personal at all, rather it was all about money. we learned that in 2005 and 2006 litvinenko made multiple visits to spain helping prosecutors take down a major organized crime ring. one that litvinenko publicly claimed had financial ties to president putin. putin's office has never responded to that allegation. anne applebaum, a pulitzer prize winning author and expert on russia -- >> i think anything that litvinenko was doing, that came close to the source of putin's personal wealth would have been by far the most dangerous things that he could do. >> reporter: in addition to a possible motive there was also the means. paul joyal says the fact that polonium was used to kill litvinenko leaves little doubt as to who authorized the murder. so does that mean it had to be

putin? it could have been someone else with access to -- >> come on, come on, you're not gonna engage in act of nuclear terrorism in downtown london without the knowledge of the office of the president. >> today we begin the open hearings in the inquiry into the death of alexander litvinenko. >> reporter: in january 2015 a public inquiry opened in london. it's a victory for marina, who, along with her attorneys, fought not eight-year legal battle to make it happen. on the opening day, her attorney argued the evidence leads to one disturbing conclusion, which litvinenko himself reached before he died. >> mr. litvinenko came to the awful realization that he had been the victim of a political assassination by agents of the russian state. >> reporter: and just yesterday an expert witness testified the polonium that killed litvinenko could have only come from russia. the kremlin appears to be ignoring the inquiry. president putin's spokesperson declined our request for an interview.

and just this week, putin gave lugovoi a medal, the order "for merit to the fatherland 2nd class," for his work in the "duma." you think russia will ever come clean and this will be known? >> i believe, one day, we will know this. it will be very obvious for people to decide. >> reporter: in the years she's been looking for answers, other questions have multiplied, other deaths have been recorded. there was boris berezovsky the russian oligarch litvinenko said he refused to assassinate. another prominent critic of putin. in 2013, he was found dead in his london home. originally called a suicide, last year a judge said he couldn't rule out murder. >> the way he killed himself -- >> reporter: he hanged himself with a scarf. >> with a scarf, in the bathroom, and the fact that his bodyguard was not there, it raises questions. >> reporter: just last month, another putin critic, boris nemtsov was gunned down in

the shadow of the kremlin. several suspects have been arrested, and the office of the president has denied involvement. the victim was about to lead a major rally against putin it went on without him. all of this intrigue and violence may seem very far away. but when nbc news consultant paul joyal was shot just a few miles from the capital, he and his wife immediately thought it was a hit. one big reason, the timing. >> it's four days after i accused the president of being responsible for the - - the horrible murder of litvinenko on your network. >> reporter: in early 2007, joyal appeared in a "dateline" report on the litvinenko case he blamed vladimir putin for the murder. just four days later he was almost murdered himself. you think they were related? >> i don't think there's any doubt. >> people out in the general public say, "oh, that's in russia.

it's never gonna happen here." but i know that it could happen here too. i know that it can happen here, because it happened to my husband. >> reporter: there's no proof the joyals are right but his assailants have never been caught. and elizabeth joyal admits at first she was angry when he decided to be interviewed again for this program. >> i said, "what are you thinking? why do you want to bring notice once again?" but then, when the man in russia was shot, i -- i had kind of an epiphany. i was like, "wait a minute. someone needs to talk about this. someone needs to say, 'this is not right.'" >> reporter: can i ask you an obvious question? why are you still doing this? why are you talking to me now, against -- >> against the advice and counsel of my family? [ laughter ] >> well, it may be foolish, but i think it's the right thing to do.

that's all for now. i'm richard engel. thanks for joining us. this sunday, she's in it to win it again. >> i am all about new beginnings. another new hair style, a new e-mail account. >> hillary announces today. why this time her biggest opponent may be herself. also rand in the race. >> i think the thing is about the clintons is that there's a certain sense they think they're above the law. >> but after this week some are asking whether he has the temperament to be president. i'll bring you my interview with the senator from kentucky. plus cameras on cops and that police shooting in south carolina. >> i saw him running like -- >> how would that story have been covered if no one this come forward with the video? i'm chuck todd. joining me this sunday morning are david brooks of "the new york times,"