My 600-Lb Life star Dolly Martinez has sadly passed away. Fans of the TLC show will definitely recognize the reality star. Her brightly-colored hair and her surprisingly young age during season 10 of the series caught fans' attention and she gained a small following after her episode premiered. At 25, she became one of the youngest subjects of the show's history. Heartbreakingly, over the weekend, Dolly's sister Lindsey Cooper revealed on Facebook that the star died. She wrote in a post: "It is with a heavy heart that I share the passing of my beautiful sister, Dolly.