Dolly Martinez, who appeared in the 10th season of My 600-lb Life, has died at the age of 30. Martinez's sister, Lindsey Cooper, released a statement about her death on Facebook, writing, "It is with a heavy heart that I share the passing of my beautiful sister, Dolly.""Dolly had the brightest personality she could light up any room with her laughter, her kindness, and her loving spirit. She had a way of making everyone feel special, and her warmth will stay with us forever. While our hearts are broken here, I find comfort in knowing she is now reunited with our dad in heaven.