CarlsenHighway "Hemingway may have been a functioning alcoholic, but he had hemochromatosis, which has depression as a symptom, as did his father, who also committed suicide. (As did his brother and sister too.) Hemingway also had over ten electric shock treatments just prior to his death, and was a mental wreck. He shot himself four days after being released. I don't think drink had much to do with his death. Or boxing.
Hemchrmatosis is an interesting ailment. Here's a short definition and symptoms of it from Mayo Clinic.