June 30, 1972 - Sergei Dovzhenko
His position within the Mariupol police force gave him both the tools and the cover to operate undetected across nearly four years, during which he confessed to nineteen killings. The fact that the perpetrator was an officer of the law rather than someone the law was hunting shaped the particular nature of this case and its aftermath.
From Wikipedia
Sergei Ivanovich Dovzhenko (Russian: Серге́й Иванович Довже́нко, Ukrainian: Сергій Іванович Довже́нко, romanized: Serhii Ivanovych Dovzhenko; born June 30, 1972) is a Ukrainian serial killer. A former operative of the Mariupol police, he confessed to committing 19 murders between November 1998 and May 2002 in his native city. Among his victims are a 12-year-old girl, four employees of the Ministry of Internal Affairs of Ukraine and one Yugoslav citizen.
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