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9. Mary Ann Cotton
Holy Mother of evil ! This one was a nurse as well, but don’t panic she was more instrumental and chemical in her ways. She knew how to cover her tracks and leave no evidence. She obeyed all the rules in the book of murderesses. She was careful of whom to choose, when to kill and how to kill. Over a twenty year phase she killed families, husbands she didn’t like, kids she thought were ugly, women she thought were religious, and step children who weren’t meant to be step children in the first place by arsenic poisoning, I mean a lawyer isn’t that picky. I could have given her the honor of freeing people of their troubles, “The Arsenic Award”. She was oscillated (hanged) on 24 March 1873 at the Durham Prison.