Kelly Clarkson has canceled her appearance at Miranda Lambert and Parker McCollum's upcoming Texas flood benefit concert in the wake of her ex-husband Brandon Blackstock's death.

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,

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.