Martin Short's daughter's cause of death has been confirmed. The actor, 75, was dealt with personal tragedy last week when it emerged that Katherine had passed away at the age of 42. The Hollywood star adopted Katherine and her siblings Oliver and Henry with his late wife Nancy Dolman, who died in 2010 after being diagnosed with ovarian cancer. He and Nancy were married for 30 years. Now, it's been revealed that Katherine died from a self-inflicted gunshot wound to the head, according to a