One of my sons, at the time he was 18. Six foot, 4 at over 250 lbs. He never said a word. His looks alone told me the whole story of his feelings. I remember leaving from a visit that day with a feeling I lost my children and if this son had lost his temper at that moment, I would have maybe lost my life.
Just keep doing the right things. Don't speak ill of him. Encourage them to keep contact but don't push them. If they want, they will contact him. Answer any questions with truth. Don't try to cover up for him. Why did this happen? Because of an illness. Alcohol can cause a disease called alcoholism. As questions arise, try to help them understand... it isn't, wasn't, their fault. A disease that only he can seek the cure for has brought this about. We can't fix it, only he can.