Mikhail Viktorovich Popkov is a Russian serial killer, abuser, and necrophile who committed the sexual assault and murder of eighty-three people between 1992 and 2010 in Angarsk, Irkutsk, in Siberia, and Vladivostok in Far East, although he has confessed to and is suspected of at least eighty-six in total. He is known as "the Werewolf" and "the Angarsk Maniac" for the particularly brutal nature of his crimes; he would extensively mutilate the bodies of his victims and perform sexual acts on them. Popkov was also known as "the Wednesday Murderer" due to bodies of his victims usually being found on Wednesdays. He is the single most prolific serial killer in Russian history. He escaped prison in 2024 and fled from Russia.