
Well, I know why... because he was fucking stupid! When you keep deer in captivity, especially bucks, they become very territorial, especially when they are in "rut" (aka HORNY... yes I mean that in both possible ways). Since the buck probably thought that Ronald was interfering with his courting of a doe, he decided he had enough and gored the idiot to death. Imagine, a man who had been a hunter for so long getting killed by the very thing he hunted... and it wasn't a predator.
Doe! I mean... Doh!
Ronald Donah (1963 - 2006)