Joni Sledge of the vocal pop group Sister Sledge has passed away at the age of 60 from an unknown cause. She formed Sister Sledge in 1971 with her sisters Kim, Debbie, and Kathy as they struggled for eight years until they hooked up with a couple of producers to work on the hit song We Are Family. Other hits include He’s The Greatest Dancer and Frankie. They continued to perform together over the years until her passing. The song continues to be played in radio stations. Joni Sledge will be missed by all worldwide.