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Werewolf' of Siberia ranked among worst serial killers ever after confessing to 81 victims, says Russian media - The Washington Post
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Russian serial killer policeman Mikhail Popkov "the Werewolf" of Angarsk found guilty of 56 more murders in Irkutsk - CBS News
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Bloody bodies & twisted motives: Siberian butcher cop & other Russian serial killers — RT World News
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