George Zimmerman’s attorney Mark O’Mara told In Session correspondent Jean Casarez on Wednesday that his client’s “Stand Your Ground” hearing is set for April 22.

Zimmerman claims he shot Martin in self-defense, and Florida's "Stand Your Ground" law could allow him to avoid criminal and possibly even civil liability for killing Trayvon Martin.

At the hearing, Zimmerman’s attorneys will have to convince Judge Debra Nelson of three things:

• Zimmerman was not engaged in an unlawful activity.
• Zimmerman was being attacked in a place he had a right to be.
• Zimmerman had the reasonable belief that his life and his safety were in danger as a result of an overt act or perceived threat committed by Martin.

If Zimmerman’s attorneys are successful at the hearing, their client could walk out of court a free man with immunity from prosecution. However, if they don’t convince the judge, Zimmerman will face a full criminal trial on June 10. At trial, Zimmerman will still be able to argue self-defense.

Zimmerman has pleaded not guilty to a second-degree murder charge for shooting Martin on Feb. 26, 2012. Martin was returning from a convenience store and was unarmed. Zimmerman told police he shot the teen in self-defense.

Zimmerman’s next hearing is scheduled for March 5.