Kelly Clarkson performed an emotionally charged rendition of "Piece by Piece" not long before the death of Brandon Blackstock, her ex-husband and father of her two children. Blackstock, a former talent manager,

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 Blackstock died of skin cancer. On Monday, the Silver Bow County Coroner, Dan Hollis, confirmed to Rolling Stone that Kelly Clarkson’s ex-husband died of melanoma on Aug. 7.