Blackstock has passed away following a secret three-year battle with cancer, a family spokesperson revealed in a statement.

A lot of questions have surrounded Kelly Clarkson over the past several months due to absences from her talk show and canceled concert dates. An unfortunate explanation came on August 7, when it was revealed that her ex-husband Brandon Blackstock died of cancer after a private three-year battle.

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?