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

Danielle Spencer — the beloved actress who played “Dee” on the classic sitcom What’s Happening!! — has passed away at age 59, and her family is opening up about the devastating chain of health struggles that led to her death.

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 .