March 18, 1939 - Sofia Zhukova
What distinguishes her case is less the number of crimes than their span — three killings stretched across fourteen years, with the last committed at an age when most people are long retired from any endeavor. The extended timeline and her age at the final offense made her an outlier in Russian criminal history, a record that speaks to the difficulty of pattern recognition across such a wide interval.
From Wikipedia
Sofia Ivanovna Zhukova (Russian: Софья Ивановна Жукова; 1939 – 29 December 2020) was a Russian serial killer who committed three murders between 2005 and 2019. At the time of her last crime, she was 80 years old, making her the oldest serial killer in the history of Russia and the Soviet Union. Some sources claim that Zhukova partially ate her victims. She died of COVID-19 before trial and was found guilty posthumously.
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