Brandon Blackstock's cause of death revealed Kelly Clarkson's ex-husband Brandon Blackstock passed away from melanoma, a form of skin cancer. 11 August 2025 Brandon Blackstock's cause of death has been confirmed. Brandon Blackstock's cause of death has been confirmed The talent manager, who was married to pop star Kelly Clarkson from 2013 to 2022, sadly passed away at the age of 48 last week and it has been revealed that he died from melanoma - a form of skin cancer - by Silver Bow County Coroner Dan Hollis.