Alexander Litvinenko
On 1 November 2006, Litvinenko suddenly became sick and was hospitalized. He died in London three weeks later, as a result of poisoining by polonium-210. The news of his death spread around the world, and many felt the poisoning was done by the Russian government. Vladimir Putin and Kremlin spokesmen have repeatedly denied this, and many new leads have been taken upon during the case. Although there are some suspects and theories in the murder, no official arrest has been made yet.