Joan Elise Sledge (September 13, 1956 – March 10, 2017) was an American singer–songwriter, actress and producer. Sledge was best known as a founding member of the American family vocal group Sister Sledge, who were best known for their hits during the mid–1970s through the mid–1990s; most notably 1979's "We Are Family" and "He's the Greatest Dancer". Sledge died from natural causes on March 10, 2017 at age 60.