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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 handli...

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. the cells...

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 ...

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 with litvinenko's murder. coming up -- the stakes get even higher as we confront a top russian official. when "dateline" continues. with this...

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 p...