Dmitri Kovtun claims Alexander Litvinenko was carrying around polonium without knowing it . Says the ex-spy 's death was 'accidental suicide ' during press conference . Comment:
Dmitri Kovtun claims Alexander Litvinenko was carrying around polonium without knowing it . Says the ex-spy 's death was 'accidental suicide ' during press conference . Kovtun denies murdering Litvinenko , but has agreed to give evidence at the public inquiry into his death .