Nannie Doss, born Nancy Agnes Hazel (November 4, 1905 - June 2, 1965), was an American serial killer who confessed to the murders of 11 people--four husbands, two children, one of her sisters, her mother, two grandsons, and a mother-in-law--between 1927 and 1954. Doss was also referred to as the Giggling Granny, the Lonely Hearts Killer, the Black Widow, and Lady Blue Beard.