Margarita Sierra (January 5, 1936 - September 6, 1963), born as Maria Margarita Suarez Sierra in Madrid, Spain, was a singer, dancer, and actress perhaps best known for her supporting role as the nightclub-singing Cha Cha O'Brien on the early 1960s ABC/Warner Brothers television series, Surfside 6, with Troy Donahue, Van Williams, Lee Patterson, and Diane McBain.
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