What caused ernest hemingway's death?

He unlocked the basement storeroom where his guns were kept, went upstairs to the front entrance foyer of their Ketchum home, and "pushed two shells into the twelve-gauge Boss shotgun ...put the end of the barrel into his mouth, pulled the trigger and blew out his brains." Mary called the Sun Valley Hospital, and Dr. Scott Earle arrived at the house within "fifteen minutes". Despite his finding that Hemingway "had died of a self-inflicted wound to the head", the story told to the press was that the death had been "accidental".[144]Ernest Hemingway - Wikipedia, the free encyclopedia