Last of George Zimmerman evidence released

Audio of Zimmerman's lie detector among evidence

Published On: Jun 27 2012 02:34:47 PM EDT   Updated On: Jun 27 2012 07:04:22 PM EDT

The state attorney's office released the last piece of initial discovery Wednesday in the case against George Zimmerman, the neighborhood watch member who police said shot and killed 17-year-old Trayvon Martin.

Judge Kenneth Lester ordered the release of two voice exemplars at 2 p.m. Wednesday.

In March, Zimmerman was asked to yell, "Help!" and, "Help me!" several times as operators listen, so the recording could be used to see whether his voiced matched one on a 911 call from Feb. 26, the night Martin was shot. Click here to listen.

Two FBI experts have already said it is impossible to tell whether it was Zimmerman or Martin screaming for help.

In the latest test, investigators had Zimmerman yell, "Help!" 22 times and "Help me!" 17 times to recreate the original crime scene audio.

Zimmerman is charged with second-degree murder in Martin's death. He has pleaded not guilty, claiming self-defense.