Blackstock died at his home in Butte, Montana, on Aug. 7. He was 48. The death certificate said that his cause of death was malignant melanoma, or a type of skin cancer, with his manner of death listed as natural causes, People magazine reported.

More details of the death of Brandon Blackstock, the talent manager and former husband of Kelly Clarkson, have come to light ahead of his Aug. 17 memorial service. A death certificate, officially filed Thursday in Butte,

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.