Instagram/Martin Short & Nancy Dolm Celebrity Official cause of death confirmed for Martin Short's daughter, Katherine Hartley Short, 42, who died from a self-inflicted gunshot wound in her Hollywood Hil... March 11, 2026 AceShowbiz - The cause of death for Katherine Hartley Short, daughter of actor Martin Short, has been officially confirmed. According to the Los Angeles County Department of Public Health death certificate obtained by TMZ, Katherine died from a self-inflicted gunshot wound to the head. The certificate also states that Katherine, aged 42, was cremated following her passing.