The talent manager died at 48 of a form of skin cancer as the singer and TV host has canceled tapings and concerts as the news was revealed.

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,

Dan Hollis, a coroner in Silver Bow County, Montana, tells USA Today that Blackstock, 48, had melanoma, a cancer that originates in melanocytes, cells that give skin its color. Melanoma often is caused by exposure to the sun, but the exact cause isn’t clear, according to the Mayo Clinic.