Article continues below advertisementMartin Short is still reeling from his daughter Katherine's shocking suicide.Katherine died on February 23 at the age of 42 from a self-inflicted gunshot wound. While the Only Murders in the Building star, 75, has the support of his celebrity friends during this difficult time, he's "inconsolable."Article continues below advertisementSource: MEGAKatherine Short died from a self-inflicted gunshot wound."This is as much of a horror to Martin and his sons, her brothers, as humanly possible," an insider told Daily Mail on February 25.