September 17, 1978 - Stephan Letter
His case marked a grim chapter in the history of healthcare-related homicide in Germany — a nurse who exploited institutional access to commit killings on a scale that went undetected for over a year. The victims were patients, already vulnerable, and the setting was one of care. He held this grim distinction as the most prolific killer in postwar Germany until a comparable case emerged years later.
From Wikipedia
Stephan Letter (born 17 September 1978) is a German serial killer and former nurse responsible for the murder of at least 29 patients while he worked at a hospital in Sonthofen, Bavaria, between January 2003 and July 2004. His murders were described as the largest number of killings in Germany since the Second World War, until the discovery of Niels Högel's crimes.
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