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 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,

"Brandon bravely battled cancer for more than three years," a representative for his family said in a statement.