Article continues below advertisementBrandon Blackstock's death certificate was just released, providing more insight into his sudden passing at age 48 on August 7.The death certificate was confirmed by the Butte-Silver Bow County Clerk and Recorder's office in Butte, Mont., on Wednesday, August 13. Officials certified that Kelly Clarkson's ex died at 11:13 a.m. at his home in Butte.The document added that his cause of death was a type of skin cancer called malignant melanoma, and he passed from natural causes.Article continues below advertisementSource: MEGABrandon Blackstock had skin cancer.