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? 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.
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-corruption? anti-corruption was 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, mi6. glenmore trenear harvey was a retired and very charming mi6 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.