Brandon Blackstock suffered from seizures as he bravely battled cancer. Kelly Clarkson’s ex-husband passed away last week at age 48 after a private three-year fight with melanoma, a serious skin cancer, but his death certificate reveals even more about his health issues.

The singer was scheduled to appear at Miranda Lambert and Parker McCollum's Band Together Texas event taking place on Sunday to support those affected by the floods in July. However, Clarkson has canceled as a result of Blackstock's death last week, according to a since-expired Instagram Stories post from the concert's organizers.

Kelly postponed her Vegas shows five months after she took a sudden break from her talk show in March. Brandon’s illness has since been revealed. Despite her divorce from ex-husband Brandon Blackstock,