Brandon Blackstock spent his heartbreaking final days surrounded by family, but his ex-wife, Kelly Clarkson, was not his primary caregiver.

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

Kelly Clarkson’s ex-husband Brandon Blackstock’s cause of death has been revealed less than a week after the talent agent passed away at age 48. Blackstock’s cause of death was melanoma, a form of skin cancer,