December 13, 1960 - Yvan Keller
Operating across three countries over nearly two decades, this French serial killer targeted victims with a consistency that allowed him to evade detection for years. The gap between confirmed killings and his own stated count — 23 documented versus roughly 150 claimed — reflects both the difficulty investigators faced in tracing his movements and the uncertainty that still surrounds the true scale of his crimes.
From Wikipedia
Yvan Keller (13 December 1960 – 22 September 2006), nicknamed The Pillow Killer, was a French serial killer. Between 1989 and 2006, he killed at least 23 people in France, Switzerland, and Germany, and confessed to killing about 150. If corroborated, that would make him the most prolific French serial killer of the 20th century.
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