@thetrueone - That's why I would have gone with manslaughter. The guy made a stupid decision by getting out of his car and forcing a confrontation. But stupidity is not a crime. And dead men tell no tales. If Zimmerman had even the slightest wound on the back of his head or evidence of a broken nose, most juries are going to take his side of the story, and believe he was in fear of his life based on reasonable doubt.
In some States, the jury may consider lesser charges, so they may consider manslaughter even if they decide against murder, but I haven't looked up if that is the case in Florida.