Nannie Doss (born Nancy Hazel, November 4, 1905 – June 2, 1965) was an American serial killer responsible for the deaths of 11 people between 1927 and 1954. Doss was also referred to as the Giggling Granny, the Lonely Hearts Killer, the Black Widow, and Lady Blue Beard. Doss finally confessed to the murders in October 1954, after her fifth husband died in a small hospital in Tulsa, Oklahoma. In all, it was revealed that she had killed four husbands, two children, one of her sisters, her mother, two grandsons, and a mother-in-law. Early life.
https://en.wikipedia.org/wiki/Nannie_Doss