For anyone saying he was poisoned. I can tell you that is 99% unlikely. I have a background in toxicology. Most poisons act in 2 ways, acutely, meaning you die within 24 hours, or chronically, meaning it takes weeks or months of ingestion to kill. His pattern of symptoms doesn't fit either.
His symptoms are most similar to an acute pathological process. As I mentioned earlier in this thread when he first started posting about his illness the symptoms that he mentioned, RUQ pain with nausea, vomiting, etc... , given his recent history, either acute hepatitis and/or acute pancreatitis were most likely. Gastroenteritis from a viral or bacterial origin was unlikely as a result of his chronic alcohol intake, which is actually protective against microbial gastroenteritis.
There is a certain point where no amount of medical intervention will make a difference, and he likely crossed that threshold sometime on Thursday. Unless he had gotten medical help sometime on Wednesday it is very unlikely any medical help would have made a difference.
Hopefully someone makes this clear to his father so he doesn't think "If only I had gotten there earlier in the day" it is almost certain getting there sooner on Thursday wouldn't have made any difference in the outcome.