Child star Danielle Spencer, who portrayed Dee Thomas on the 1970s comedy TV series “What’s Happening!!,” has died at 60, according to former co-star and friend Haywood Nelson.

A family spokesperson said Spencer died Monday after battling cancer for several years. As Dee, she was a deadpan, wisecracking sister on What's Happening!! Spencer later became a veterinarian.

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 .