The talent manager “passed away peacefully at his home in Butte, Mont., on Aug. 7 under hospice care surrounded by his family.”

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,

"Brandon Blackstock passed away peacefully at his home in Butte, Montana on August 7th under hospice care surrounded by his family,” Silver Bow County Coroner Dan Hollis told multiple media outlets including PEOPLE and Fox News Digital .