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.

Former child star Danielle Spencer, who brought sass to the 1970s sitcom 'What's Happening!!,' died Monday after years of health issues.

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.