According to the official death certificate obtained by People Thursday, seizures were listed as “significant conditions contributing to death but not resulting in the underlying cause.” Kelly Clarkson’s ex-husband’s official cause of death was listed as malignant melanoma.

Brandon's illness made headlines on August 6, 2025, when Kelly announced the postponement of her Vegas residency. Just one day later, he died. Find out what happened to him.

Brandon Blackstock's official cause of death has come to light, days after the talent agent and ex-husband of Kelly Clarkson died of natural causes at age 48.