From wikipedia.

Recordings of eight calls to the police made on the night of the shooting were released by the Sanford police on March 17, 2012.

A witness to the confrontation just prior to the shooting stated that Martin was on top of Zimmerman and punching him, while Zimmerman was yelling for help. This witness, who identified himself as "John", stated that "the guy on the bottom, who had a red sweater on, was yelling to me, 'Help! Help!' and I told him to stop, and I was calling 911". He went on to say that when he got upstairs and looked down, "the guy who was on the top beating up the other guy, was the one laying in the grass, and I believe he was dead at that point."

I get the impression that for many posters, that this defendant is guilty until someone can convince them otherwise....which is impossible as there's usually no convincing anyone on the OD forum

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With best regards

Al