http://usnews.msnbc.msn.com/_news/2012/04/12/11166967-george-zimmerman-expected-to-take-the-stand-in-trayvon-martin-murder-case-legal-observers-say?lite
"But Zimmerman....will need to explain why he thought his life was in danger when he shot the unarmed black teenager, attorneys not involved with the case say."
“There is no way around it,” Derek Byrd, incoming president of the Florida Association of Criminal Defense Lawyers, told msnbc.com. “I personally believe he would have to testify. It’s not like a case where there were three other witnesses. Who else is going to say he was fearing for his safety when he shot Trayvon Martin?”