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.

Former child actress Danielle Spencer, best known for starring as Dee Thomas in the ABC sitcom What’s Happening!!, has passed away. She was 60 years old. Spencer’s passing was announced by her What’s Happening!! co-star Haywood Nelson, who remembered her as a “brilliant, loving, positive, pragmatic warrior.”