Anna Maria Zwanziger
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Anna Margaretha Zwanziger (1760 - July 1811) was a Bavarian serial killer. She used arsenic, which she referred to as "her truest friend". 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. She killed four people, one of whom was a baby. Four others survived.
