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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 with litvinenko's murder. coming up -- the sta...

>> i don't think there's any doubt. >> people say oh, that's in russia, not over here. but it can happen here too. i know that it can because it happened to my husband. >> and she admits at fist she was angry when he agreed to be interview interested 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 say this is not right. >> can i ask an obvious question. why are you talking to me now against -- >> against the advice of co...

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 ...

>> 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...

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...