Lawyer : A statement on the website of the Russian Embassy in London said the Investigative Committee 's involvement would help the inquest `` in securing the all-sided , comprehensive and objective consideration of the case . '' Russia government evidence suggests Russia tied to ex-KGB agent 's death . Alexander Litvinenko worked for MI6 and Russian intelligence services , widow 's lawyer says . Litvinenko died after being poisoned by radioactive material polonium-210 in 2000 . Alexander Litvinenko on deathbed blamed Russia 's Litvinenko , but the Kremlin denies the accusation .
Lawyer : Russia government evidence suggests Russia tied to ex-KGB agent 's death . Alexander Litvinenko worked for MI6 and Russian intelligence services , widow 's lawyer says . Litvinenko died after being poisoned by radioactive material polonium-210 in 2000 . Alexander Litvinenko on deathbed blamed Russia 's Litvinenko , but the Kremlin denies the accusation .