I think the punishment was too hard, he should have gotten 3 to 5 like the min was, suspended after 1 year. He did kill the guy! He did leave the building and come back in to fight, he should have left and stayed out. Also, for his size, he should have restrained the littler guy, not deck him. That showed he was an inexperienced fighter, just a brawler. When he went back in, is that when he was sucker punched? That still should have caused him to wrestle, not box or brawl.
At no time was this bigger guy's life in jeopardy, nor was his health gravely threatened, he only faced a black eye and maybe a busted lip, and neither of those are qualifier for death, accidental or otherwise.