Former KGB officer Andrei Lugovoi, the chief suspect in the 2006 killing of Kremlin critic Alexander Litvinenko, has said he will demand Litvinenko\'s autopsy results from British police. Litvinenko, a former Russian agent and outspoken critic of then President Vladimir Putin, died in 2006 in a London hospital after being poisoned with the radioactive substance polonium-210. British police suspect Lugovoi, now a state deputy in the Russian parliament, of the murder. The Crown Prosecution Service has declined to hand over the results of the post-mortem carried out on Litvinenko\'s body, a move criticized by Russian officials. \"My lawyers and I are preparing steps to get hold of the post-mortem, the results of which were the grounds for the accusations against me,\" Lugovoi told RIA Novosti on Monday. Russia has repeatedly refused Britain\'s requests for his extradition. Lugovoi said he was not aware of the cause of Litvinenko\'s death, claiming Litvinenko was a British spy and that the UK\'s MI6 may have been behind the killing. He suggested a third country carry out an independent investigation in order to resolve tensions.