Serial Killer: Mary Ann Cotton - The Black Widow (Full Documentary)

Mary Ann Cotton was an English serial killer, convicted of, and hanged for the poisoning of her stepson Charles Edward Cotton. It is likely that she killed three of her four husbands, apparently in order to collect on their insurance policies and many others. She may have killed as many as 21 people, including 11 of her 13 children. She chiefly used arsenic poisoning, causing gastric pain and rapid decline of health.

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