Brandon Blackstock's official cause of death has come to light, days after the talent agent and ex-husband of Kelly Clarkson died of natural causes at age 48.

Brandon Blackstock, ex-husband of music star Kelly Clarkson, died last Thursday, August 7. An official cause of death for the 48-year-old has been confirmed. Silver Bow County Coroner Dan Hollis told PEOPLE Monday that Blackstock died of melanoma,

Dan Hollis, coroner for Silver Bow County, confirmed the form of skin cancer as Blackstock's cause of death to Entertainment Weekly; the manner of death was listed as natural. Blackstock, who died on Aug. 7 at the age of 48, passed peacefully surrounded by family at his home in Butte, Mont.