William Plotnikov (May 3, 1989 in Megion, Khanty-Mansi Autonomous Okrug – July 14, 2012[1]) was a Russian Canadian boxer and Canadian citizen who converted to Islam, joined the Islamist insurgent organization Caucasus Emirate in the Russian republic of Dagestan and was killed there in combat by Russian government forces. According to unconfirmed media reports, Plotnikov might have been a contact of the Boston Marathon bombings suspect Tamerlan Tsarnaev via social media and perhaps when Tsarnaev unsuccessfully attempted to join the insurgency in Dagestan as well, before returning to the United States after Plotnikov was killed.[2]