Depending on what book you read, he either died as a result of a sound pummeling from college students (Moe's autobiography, The 3 Stooges Scrapbook and others), or by the hands of Wallace Beery and Co. (The Forrester Bros. book). While the latter book is certainly open to conjecture (I'll button mine!), it does make sense. What doesn't make sense is why Healy isn't rushed to the hospital sooner. And also, we're still uncertain about WHY the argument started in the first place.