Marianne Nölle

Marianne Nölle (1938 – 28 July 2022) was a German serial killer from Cologne. She was sentenced to life imprisonment in 1993 for seven murders.

Crimes
Nölle was a nurse who between 1984 and 1992 killed patients in her care using Truxal. Police believe she killed a total of 17 and attempted 18 other murders, but she was only convicted of seven. She never confessed to her crimes. She died on 28 July 2022, at the age of 84.