Article continues below advertisementKelly Clarkson's ex-husband, Brandon Blackstock, has died from cancer at age 48."It is with great sadness that we share the news that Brandon Blackstock has passed away," a rep for the family told a news outlet. "Brandon bravely battled cancer for more than three years. He passed away peacefully and was surrounded by family. We thank you for your thoughts and prayers and ask everyone to respect the family's privacy during this very difficult time.