Tributes have begun to pour in for '70s child star Danielle Spencer, who passed away on Monday after a lengthy battle with cancer .

The 60-year-old was a fan favorite on the show What's Happening!! , which ran for three seasons between 1976 and 1979, and followed the lives of three boys growing up in a South Los Angeles neighborhood.

She portrayed their younger sister, Dee Thomas, known for her sassy one liners and signature phrase, "Ooh, I'm gonna tell Mama!"

The actress reprised her role in the sequel series, What's Happening Now!! from 1985 to 1988.

Learn more about the celebrities who were gone too soon below... WATCH: Movie Stars Gone Too Soon

A long road

© WireImage Danielle's car crash led to a lifetime of health issues

Danielle endured decades of pain after bei

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