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

Danielle Spencer, who played the wisecracking and tattling little sister Dee Thomas on the 1970s sitcom “What’s Happening!!” has died.

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.