Nannie Doss (born 4 November 1905 – 2 June 1965) was a serial killer responsible for the deaths of eleven people between the 1920s and 1954. She finally confessed to the murders in October 1954, when her fifth husband had died in a small hospital in Tulsa, Oklahoma. In all, it was revealed that she had killed four husbands, two children, her two sisters, her mother, a grandson and a nephew. She has been given the monikers "The Giggling Granny" and "The Jolly Black Widow".

Margie Velma Barfield (October 29, 1932 – November 2, 1984) was the first woman in the United States to be executed since 1962. She was also the first woman to be executed by lethal injection. She killed her mother, husband, a few boyfriends and several individuals she was a caretaker for.