Brandon Blackstock spent his heartbreaking final days surrounded by family, but his ex-wife, Kelly Clarkson, was not his primary caregiver.

Sources tell PEOPLE that Blackstock, who was previously married to Kelly Clarkson, moved to Montana three years ago, when he was diagnosed, and bought the home in Butte where he died. In a statement announcing his death, a rep for the family echoed Hollis's statement, and also noted that Blackstock was "surrounded by family" when he died.

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.