Kelly Clarkson abruptly cancelled her Las Vegas shows, announcing that her ex-husband, Brandon Blackstock, was ill. Then, came the tragic news that Blackstock was dead at the age of 48. What was his cause of death?

Brandon Blackstock, whose marriage to and contentious split from Kelly Clarkson put him in the celebrity spotlight, has died of cancer at age 48.

Brandon Blackstock, a talent manager and the former husband of Kelly Clarkson, has died. "Brandon bravely battled cancer for more than three years. He passed away peacefully and was surrounded by family,