My 600-Lb. Life's Dolly Martinez has died. She was 30. "It is with a heavy heart that I share the passing of my beautiful sister, Dolly," Lindsey Cooper, Martinez's sister, wrote via Facebook on Saturday, April 11, confirming her sibling's untimely death. "Dolly had the brightest personality she could light up any room with her laughter, her kindness, and her loving spirit," she added. "She had a way of making everyone feel special, and her warmth will stay with us forever.