That snoring sound you hear after he is knocked unconscious, is called the death rattle.
"A death rattle is a gurgling or rattle-like noise produced shortly before or after death. Those who are dying may lose their ability to swallow, resulting in such an accumulation. While it is medically established[citation needed] that the death rattle is a strong indication that someone is near death, it can also be produced by other problems that cause interference with the swallowing reflex, for instance, brain injuries."
There is a very good chance he died after taking such devastating head trauma. I hope justice gets served to all those sad and pathetic individuals involved.