Anna Maria Zwanziger

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Anna Margaretha Zwanziger (7 August 1760 – 17 September 1811) was a Bavarian serial killer.[1] She used arsenic, which she referred to as "her truest friend".

From 1801 until 1811, Zwanziger was employed as a housekeeper at the home of several judges in Bavaria. She would poison her employers with arsenic, and then nurse them back to health to gain their favour.[1] She poisoned three people, and attempted to poison several others[1] She killed four people, one of whom was a baby.[2]

Zwanziger was judged guilty of murder and sentenced to death. Before she was beheaded, she said it was probably a good thing she was to be executed, as she did not think she would be able to stop.[2]