Dr. Danielle Spencer, the former child star of ABC’s 1970s show, What’s Happening!! , died on Monday at the age of 60, according to her brother and former co-star, Jeremy Pelt.

“I lost a big part of myself,” Pelt wrote in an Instagram post. “After many years, my big sister, Dr. Danielle Louise Spencer lost her battle with cancer. Many of you knew her as ‘Dee,’ but she was more than a child actress.”

“She was a friend, an auntie to my three children who adored her, she was a daughter — and in many ways, my mother’s best friend, she was a veterinarian, she was someone who always remained positive even during her darkest days fighting this disease,” Spencer’s brother added.

Pelt went on to refer to his sister as his “protector,” adding, “My immediate family, of which there were only th

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