Dorothy McGuire of the McGuire Sisters dies at 84

Singer Dorothy McGuire (right) of the popular 1950s musical trio the McGuire Sisters has passed away at the age of 84, her daughter-in-law Karen Williamson tells the AP. McGuire died of natural causes on Friday (Sept. 7) at her son's Phoenix-area home.

The McGuire Sisters, made up of eldest sister Christine, 86 (left), middle sister Dorothy and youngest sister Phyllis, 81 (middle), began singing together as young girls and went on to form a trio that was often compared to the Andrews Sisters. The McGuire sisters had hits with "Sincerely," "Picnic," and "Sugartime," which all sold over a million copies.

Dorothy is survived by her husband of 53 years, Lowell Williamson, two sons, two step-children and her two sisters.