SANFORD, Fla. (AP) -- Florida neighborhood watch volunteer George Zimmerman is scheduled to surrender to authorities and return to jail today after his bail was revoked last week.

Zimmerman is charged with second-degree murder in the shooting of unarmed teenager Trayvon Martin. A judge revoked bail after prosecutors argued that Zimmerman and his wife had lied to the court about their finances to obtain the bond.

Zimmerman has pleaded not guilty. He maintains he shot Martin in self-defense under Florida's so-called "stand your ground" law because the teen was beating him up. Zimmerman says the teen confronted him about being followed in a gated community outside Orlando.

Zimmerman's credibility could become an issue at trial, legal experts said, noting the case hinges on jurors believing Zimmerman's account of what happened.