Days after Kelly Clarkson’s ex-husband, Brandon Blackstock, passed away at the age of 48, the cause of his death was revealed.On August 11, it was reported that the talent manager died after a private battle with melanoma, a form of skin cancer."Brandon Blackstock passed away peacefully at his home in Butte, Montana on August 7 under hospice care surrounded by his family," Silver Bow County Coroner Dan Hollis told Fox News Digital. TV HOST DISCOVERS HE HAS SKIN CANCER DURING LIVE ON-AIR BROADCAST"It is with great sadness that we share the news that Brandon Blackstock has passed away. Brandon bravely battled