Considering that some 5 witnesses unrelated to the victim gave consistent testimony that the defendant pummeled the victim until he was unconscious, while only two witnesses - the defendant himself and his son - gave testimony to the contrary, its a rather safe bet what really happened. Although, I don't believe he intended to kill the man, so involuntary manslaughter would be a fitting verdict.
<< I don't know about you, but when I "self-defend" myself, I have the intention of protecting myself, not inflicting injury/death upon the attacker. Some people seriously need to learn what self defense is and how to control their temper. >>
Unfortunately, until someone invents an effective weapon that 'stuns' an attacker with flattery or something harmless like a boquet of flowers, self-defense REQUIRES inflicting some degree or manner of harm (whether permanent or temporary) upon an attacker. Unless you're Master Kane from Kung Fu, who can just fart and safely render seven attackers unconcious, but that is just fantasy Kung Fu, not reality.