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That? >> sasha told me. >> reporter: beware of someone coming from your past. >> beware of someone from your 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 fsb colleagues he denounced. the russian mobsters he was investigating. perhaps someone who thought he was a traitor for working with british intelligence. since november 2006 litvinenko's widow marina has been asking how big was the conspiracy? who was behind it? how high...

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 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 wi...

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. >>...

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? 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 o...

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...