the brought cast as often as you do. that is our prod cast for a friday night and this week. and we thank you for peaing here with us. have a dp weekend and goodnight for all of us here in new york. k >> he said, quote, the bastard shot me. >> he was once a kgb agent but turned into a vocal critic of russia. when he was poisoned in london, it made headlines around the world. >> it's polonium. >> a lethal toxin in a cup of tea. >> a kind of dirty little bomb. >> nuclear terrorism. >> why was he killed? we follow the tale of a dark >> are you threatened for your life? >> we'll meet and confront the prime suspect --

did you put polonium in the tea? and now is the danger coming closer? >> with two men waiting in the bushes, one man said shoot him. >> an attack on the expert helping us about this story. >> people say, oh, it's never going to happen here. i know it can happen here because it happened to my husband.

interconnected, but what about their deaths? random acts, 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-catchers of corruption and those who dare to expose it. a world in which murder happens often. was there a hit list in mind? >> i'm sure there was. >> reporter: but our story begins closer to home. on a late winter evening, paul

joyal, an intelligence analyst, was driving to his house just outside 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. and a shot went through me. >> reporter: one shot? >> one shot, and then i heard the click. >> reporter: another click? >> right. and nothing happened. >> reporter: so 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.

and that just 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 looks 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 it was not a carjacking. there's 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, carjacking? 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.

how's your cough? i'm good. i took 12-hour mucinex and sent it far away. hey buddy, have you seen a nice woman with a cough? woahhh! mucinex dm releases fast and lasts 12-hours, not 4. send coughs far away all day.

check in from afar with remote access, ♪ and have professional monitoring backing you up with xfinity home. demo in an xfinity store. call, or go online today.

we are a few minutes from london heathrow airport. >> reporter: we don't know why and who was behind it? american intelligence expert paul joyal eventually recovered from his near-fatal shooting. in january 2015, he traveled with us to london to tell us the story of what happened to an

important contact of his just a few months before joyal was shot. >> he was a law enforcement officer. >> reporter: he worked for the equivalent of the fbi? >> yeah, i mean -- >> reporter: in anti-corrputon? >> anti-corruption is what really he was most interested in. >> reporter: his name was alexander 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 fsb. 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 mi-6. glenmore trenear harvey was a retired and very charming mi-6 analyst who was asked to befriend litvinenko. the british wanted to find out what he knew about his former colleagues in the russian secret services.

>> it was of great interest to >> reporter: was he credible? >> oh, yes, he was. >> reporter: credible enough that mi-6 began paying him a monthly salary, trading information for money was one way for a former russian agent to make a living in his new home in london. then suddenly in 2006 -- litvinenko, who had always been fit and healthy, got very sick. >> it was just incredibly strong and heavy sickness, just suddenly and not stopping. >> reporter: litvinenko's wife marina watched him waste away in a matter of just days. >> oh, it was awful. his hair started to be -- >> reporter: to fall out? >> yes, and he started to look like a cancer patient treated by chemotherapy.

>> i knew he was going through unspeakable torment. >> finally they found in his blood he might have -- be poisoned. >> reporter: poisoned. doctors suspected maybe he'd ingested 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 nekrasov, 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 litvinenko 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 3:10 p.m., litvinenko and scaramella were spotted on a security camera walking west on piccadilly street. they came to this sushi restaurant, itsu, 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. one of the hotel's security cameras recorded litvinenko arriving in the lobby at 3:59 p.m. he was there to meet andrei lugovoi, another former fsb agent, seen here wearing a black leather jacket. lugovoi 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 lugovoi brought along a buddy, a man named dmitri 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 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 had 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 litvinenko named.

are you frightened for your life? -ah, the old crew! remember when we all used to go to the cafeteria and just chow down midday? -you mean, like, lunch? -come on. voted "most likely to help people save $668 when they switch." -at this school? -didn't you get caught in the laminating machine? -ha. [ sighs ] -"box, have a great summer. danielle." ooh. danielle, control yourself. i'd like to slow it down here with a special discount for a special girl. danielle, this one's for you. with a special discount for a special girl. my digestive system used to make me feel sluggish. but those days are over. now i take metamucil every day. it naturally traps and removes the waste that weighs me down. so i feel...lighter. try metamucil and begin to feel what lighter feels like. take the metamucil two week challenge

and lighten up. just take metamucil every day for two weeks. are you ready for the challenge? get started at metamucil dot com.

alexander litvinenko, 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. >> reporter: 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 know 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. >> 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. >> $8 million to $12 million to be able to get the portion that went into him. >> reporter: but who could get 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. >> reporter: you didn't poison him? >> absolutely not. >> reporter: 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 litvinenko as a source for investigations into the russian mob and spy rings. so he was giving you names of russian mafia members. >> yes, names, dates. >> reporter: 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 e-mails. 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. >> reporter: the e-mails amounted to a hit list. the next name up -- >> alexander.

>> reporter: 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. >> reporter: he says it's bs. >> i think it's just a provocation, but please check what's happening. >> reporter: 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? >> reporter: 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 in 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, lugovoi 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 3-d 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, >> reporter: five months after litvinenko's death, scotland yard issued an arrest warrant for lugovoi. kovtun's would come later. the two responded with a press conference in moscow stating their innocence. [ speaking russian ] >> reporter: russia refused to extradite them, so we traveled to moscow to find the men who are wanted in connection with litvinenko's murder. coming up -- the stakes get even higher as we confront a top russian official. could switching to geico really save you fifteen percent or more on car insurance?

did the little piggy cry wee wee wee all the way home? weeeeeeeee! we we weeeee! weeeeeeee! weeeeeeee! weeeeeeee! max. maxwell! yeah? you're home. oh, cool. thanks mrs. a. geico. fifteen minutes could save you fifteen percent or more. 3 days is really fast. sensitivity, sensodyne rapid relief is a game changer. it's going to let the dentist offer their patient sensitivity relief in 3 days. say over the course of a weekend you're going to start feeling significant results. a great dishwasher needs a great detergent. so ge appliances tested finish on over 5000 dishes proving dish after sparking dish that it's not just clean, it's finished. switch to finish quantum. recommended by ge appliances. my moderate to severe i ulcerative colitis.ing but i realized something was missing...

me. the thought of my symptoms returning was keeping me from being there for the people and things i love most. so, i talked to my doctor and learned humira can help get, and keep, uc under control when other medications haven't worked well enough. and it helps people achieve control that lasts so you could experience few or no symptoms. humira can lower your ability to fight infections, including tuberculosis. serious, sometimes fatal infections and cancers, including lymphoma, have happened; as have blood, liver, and nervous system problems, serious allergic reactions, and new or worsening heart failure. before treatment, get tested for tb. tell your doctor if you've been to areas where certain fungal infections are common, and if you've had tb, hepatitis b, are prone to infections, or have flu-like symptoms or sores. don't start humira if you have an infection. be there for you, and them. ask your gastroenterologist about humira. with humira, control is possible.

in the dead of 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 lugovoi and dmitri kovtun, hunted by both scotland yard and interpol,

suspected of killing litvinenko. around the world they were 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. 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. 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. >> reporter: 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. >> reporter: litvinenko even claimed he'd been ordered to assassinate a prominent billionaire, boris berezovsky, 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. >> reporter: and 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, berezovsky, 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 after the law was passed, 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 himself 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. >> translator: 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. >> reporter: 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 someone's tea cup and everyone'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 substance was? do you think that they knew they were handling polonium? >> reporter: why wouldn't they have known what they were handling? >> because you don't want them to know. >> reporter: but they could have done a better job not spreading it all over the place if they knew. >> they also might say no, there's no way i'm going to do that. >> reporter: i don't want to handle that 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 lugovoi and dmitri 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 since 2012. that left lugovoi. 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 -- now we ask the question the world wants answered -- did you put polonium in the tea? let's see, aleve is proven better on pain than tylenol extra strength. and last longer with fewer pills. so why am i still thinking about this? i'll take aleve.

aleve. proven better on pain. when someone breaks their it just really hurts. when that breaks yours, be strong. i know. you're lucky. man, when i was your age the only girl who would talk to me was grandma! life takes softness and strength, which is why we make angel soft with a balance of both.

meet andrei lugovoi. 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? >> translator: i remember that we talked with litvinenko about nothing in particular. and now for eight years, i am under suspicion. >> reporter: 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 to 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. >> translator: 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'm 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 had put something in there without you noticing? >> translator: no. why don't you think the polonium may have been put there into the cup after our meeting the next day or by a guy from mi-6? he brings the polonium and pours it into the cup. that's agatha christie stuff. >> reporter: mi-6 is british intelligence. lugovoi says perhaps the brits killed litvinenko to embarrass russia. retired mi-6 analyst glenmore trenear-harvey says that's nonsense if for no other reason because mi-6 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. >> reporter: 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. >> reporter: 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 mi-6 and it was lugovoi and his partner dmitri 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. >> reporter: because you're unleashing a radioactive substance? it's almost -- it's a tiny, little dirty bomb. >> it's nuclear terrorism. 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. you're made of trillions of cells.

they work together doing important stuff. the hitch? like you, your cells get hungry. feed them... with centrum® micronutrients. restoring your awesome... daily. feed your cells with centrum® micronutrients today.

feed your cells with ♪ when you have nausea, ♪ heartburn, ♪ indigestion, ♪ upset stomach, ♪ diarrhea... girl, pepto ultra coating will treat your stomach right. ♪nausea, heartburn, ♪ indigestion, upset stomach, ♪ diarrhea... try pepto with ultra coating.

>> 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 kgb 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: 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 fsb colleagues he denounced. the russian mobsters he was investigating. perhaps someone who thought he was a traitor for working with british intelligence. 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 fsb. 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 going to engage in an 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. an expert witness testified the polonium that killed litvinenko could have only come from russia. president putin's spokesman declined our request for an interview. and in 2015 putin gave lugovoi a medal, the order of merit to the fatherland, second 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: in february, 2015, another putin opponent, boris nemtsov, was gunned down in the shadow of the kremlin. several suspects have been the victim was about to lead a major rally against putin. it went on without him. all of this intrigue and

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 going to 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 paul's sailents have never been caught. and elizabeth joyal admits at first she was angry when he agreed 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 had a kind of an epiphany. 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? well, it may be foolish, but i think it's the right thing to do.

the back of the house is fire. >> a father dead in the flames, but it wasn't the fire that killed him. >> it was actually a murder. >> three murders in one year. all covered up by fires.