Brandon Blackstock, ex-husband of music star Kelly Clarkson, died last Thursday, August 7. An official cause of death for the 48-year-old has been confirmed. Silver Bow County Coroner Dan Hollis told PEOPLE Monday that Blackstock died of melanoma,

Brandon Blackstock, former talent manager and ex-husband of Kelly Clarkson, died from melanoma, a form of skin cancer.

Teddi Mellencamp reacted to Brandon Blackstock’s death and said it “really hit me hard” amid her own journey with melanoma. Blackstock’s death from melanoma comes four months after Mellencamp confirmed she had been diagnosed with stage 4 cancer.