On 23 November 2006 Aleksandr Litvinenko, a former officer of the Russian FSB secret service, died in London as a result of poisoning by radioactive Polonium-210. Litvinenko had received asylum in the United Kingdom, where he worked as a journalist, writer and consultant for the British intelligence services. On 1 November 2006, Litvinenko suddenly fell ill and with his death on 23 November . he became the first known victim of lethal Polonium 210-induced acute radiation syndrome. A British murder investigation pointed to Andrey Lugovoi, a member of Russia's Federal Protective Service, as the prime suspect. Russia denied a request for the extradition of Lugovoi. After Litvinenko's death, his widow, Marina, pursued a vigorous campaign on behalf of her husband that resulted in a public inquiry into his death which began on 27 January 2015, and concluded in January 2016 that Litvinenko's murder was an FSB operation, that was probably personally approved by Vladimir Putin.