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.
Episodes of Surfside 6 often featured Sierra singing, usually in English but occasionally in Spanish. The Cha Cha Twist, a song featured during the show's second and final season, was released as a single on Warner Brothers Records but did not enter the Billboard Top 100 chart.
Sierra died in Hollywood, California, in 1963 at the age of twenty-seven from complications following heart surgery performed a day earlier.She is interred at Holy Cross Cemetery in Culver City, California.
Read more about Margarita Sierra: Television