Nannie Doss (born Nancy Hazel, November 4, 1905 – June 2, 1965) was an American serial killer responsible for the deaths of 11 people between some time in the 1920s and 1954. Nannie Doss was referred to as the Giggling Granny, the Lonely Hearts Killer, the Black Widow, and Lady Blue Beard. She was called a "self-made widow" by a newspaper.Doss finally confessed to the murders in October 1954, after 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 mother-in-law.