TMZ.com: 'My 600-Lb. Life' Star Dolly Martinez's Cause of Death Revealed - 'MY 600-LB. LIFE' DOLLY MARTINEZ CAUSE OF DEATH RELEASED ... Dolly Martinez, who appeared on "My 600-Lb. Life," recently died ... and TMZ has learned more about her tragic passing. - Staci Thurman, Dolly's mom ...