Kelly Clarkson's ex-husband Brandon Blackstock's death certificate says seizures were a significant contributing factor in his Aug. 7 death.

Certified by the Butte-Silver Bow County Clerk and Recorder’s office in Butte, Montana, on Wednesday, Aug. 13, the death certificate verified that Blackstock died at 11:13 a.m. at his home in Butte on Thursday, Aug. 7, at the age of 48.

Brandon Blackstock suffered from seizures as he bravely battled cancer. Kelly Clarkson’s ex-husband passed away last week at age 48 after a private three-year fight with melanoma, a serious skin cancer, but his death certificate reveals even more about his health issues.