A singer who was a member of a popular 1950s vocal group died late last week at 84, according to The Hollywood Reporter. Dorothy McGuire, one of the three McGuire Sisters, died Friday in Paradise Valley, Ariz., after suffering from Parkinson’s disease and age-related dementia, the story reports.

Dorothy McGuire was the middle sister of the three in the singing group, between Christine, 86, and Phyllis, 81. Both Christine and Phyllis survive her.

The sisters had a string of hits in the 1950s, including 1954’s “Sincerely,” 1957’s “Sugartime” — both number ones — “Goodnite, Sweetheart, Goodnite” (1954) and “Something’s Gotta Give” (1955). They were regulars on TV variety shows into the 1960s, appearing on shows hosted by Ed Sullivan, Milton Berle, Andy Williams, Perry Como and others, the story notes.

They stopped performing regularly in 1968, but reunited a number of times — including doing a nightclub tour in 1986 and a PBS special in 2004.

Dorothy McGuire was married to Lowell Williamson, a wealthy oilman, for 53 years. Together, they had two sons, Rex and David.

Here’s a clip of the McGuire Sisters doing a medley of their hits from the PBS special in 2004 …