3. Mary Ann Cotton
This serial killer seemed to have definitely been motivated by money, though that’s surely not the final motive of her ghastly deeds. Mary Ann Cotton was confirmed to have been responsible for the deaths of three of her four husbands, although she is thought to have murdered 21 victims in all, which includes eleven of her 13 children as well as her own mother.
Her main instrument of murder was arsenic poisoning, which caused great gastric pain and the accelerated decline of life force in her victims. After a 20-year long spree of mysterious murders surrounding Cotton’s life, she was eventually arrested and put on trial in 1873. Mary Ann Cotton was convicted of the murder of three of her husbands and was sentenced to death by hanging.
The execution was not a smooth one; Cotton’s trap door proved to be too short, and she writhed wildly at the end of her rope until she eventually choked to death.
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