A high definition video of Zimmerman on the night he shot Trayvon Martin offers evidence that supports his version of the story. The video clearly shows a large wound on the back of his head consistent with hi head being slammed against the pavement. If Martin was also trying to disarm him, he surely could have feared for his life.
On the other hand, if Martin was struggling with Zimmerman to get his gun, he probably feared for his life as well and it appears it may have been his voice on the 911 call screaming for help. Two voice experts have said the voice isn't Zimmerman's.
No matter how you look at this case, it's a tragic mess. Pray for everybody involved and for a cooling off of the racist rhetoric. One of Zimmerman's neighbors said she often saw Latinos and blacks at their home and there was no evidence of racism in the family.