Danielle Spencer, who played the wisecracking little sister Dee Thomas on the 1970s sitcom “What's Happening!!” has died. She was 60.

Former child star Danielle Spencer, who brought sass as little sis Dee in the 1970s sitcom 'What's Happening!!,' died Monday after battling cancer. She was 60.

Danielle Spencer, who played the precocious youngster Dee Thomas on the 1970s ABC sitcom What’s Happening!!, has died. She was 60. Spencer died Monday in a hospital in Richmond, Virginia, her What’s Happening!! co-star Haywood Nelson told The Hollywood Reporter .