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.

Brandon Blackstock, the talent manager and former husband of Kelly Clarkson, died of melanoma, a form of skin cancer, on Aug. 7. The Silver Bow County Coroner Dan Hollis tells PEOPLE Blackstock "passed away peacefully at his home in Butte,

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,