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 dealt with a private health crisis for three years before he died on Thursday, Aug. 7. In announcing his death, a representative for the talent manager and his family revealed that Blackstock,