Zimmerman was an idiot, wreckless and careless. I expect there to be civil suits about this case. That said, and I do blame Zimmerman for this, that said, he might not have technically committed a crime.
The civil suits will be heard or not, as the judge(s) decide.
Per one of the comments at the article:
Eventually, Martin the 6’3 140lb football player (tall, fast, and lean) got the upperhand on the 5’2 250lb (short, slow, and overweight) Zimmerman. So much so that he is actually on top of Zimmerman on the ground beating the crap out of his face (he broke his nose) and slammed Zimmerman’s head into the concrete causing it to bleed.
Zimmerman cries for help, as a result of this fight domination by Martin, went unanswered and as a last resort he shot Martin to save his own life. If you have never had someone on top of you beating your face and banging your head into concrete then you don’t know how deadly that can be.