Two forensic voice experts have told The Orlando Sentinel Saturday that neighborhood watchman George Zimmerman was not the voice crying for help in the 911 calls after he shot Trayvon Martin.

Tom Owen, a forensic consultant for Owen Forensic Services LLC and a court-qualified expert witness, used software called Easy Voice Biometrics to compare Zimmerman’s voice to the 911 calls with cries in the background before the shooting on February 26th.

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“I took all of the screams and put those together, and cut out everything else,” Owen said. “As a result of that, you can say with reasonable scientific certainty that it’s not Zimmerman.”

Another expert, Ed Primeau of Michigan, used audio enhancement and human analysis to also determined that it was the slain teenager’s voice instead of his shooter.

“I believe that’s Trayvon Martin in the background, without a doubt,” Primeau told The Orlando Sentinel. “That’s a young man screaming.”

This story has been updated from a previous version.