Instagram/Martin Short Celebrity Martin Short opens up about the heartbreaking loss of his daughter Katherine, her long battle with mental illness, and the family's profound grief. May 11, 2026 AceShowbiz - Martin Short has shared heartfelt reflections following the loss of his daughter Katherine Short, who passed away. He described this chapter as a profound and painful ordeal for his family, shedding light on the challenges Katherine faced throughout her life. Martin Short revealed that Katherine struggled for many years with severe mental health issues.