Danielle Spencer starred as Dee Thomas on What's Happening!! from 1976 to 1979. Costar Haywood Nelson publicly announced that Thomas died of cancer at age 60 on Mond

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

Dr. Spencer played the wisecracking Dee Thomas on the 1970s sitcom “What’s Happening!!” and became a veterinarian later in life.