The state attorney's office is releasing some new evidence in the case against George Zimmerman , the neighborhood watch captain who shot Trayvon Martin in Sanford in February.

During the phone call to an unidentified 911 dispatch center, someone from the state attorney's office has Zimmerman yelling "help" and "help me" repeatedly at a distance from the phone to simulate the cries for help heard over the phone during a neighbor's 911 call the night of the shooting as Zimmerman and Martin struggled outside.

Zimmerman is scheduled to be in court Friday for a second bond hearing.  He was first released on bail at $150,000 but a judge revoked that after prosecutors say his wife, Shellie, misled the court during an April hearing.

AUDIO: Zimmerman Voice Test