Trayvon Martin’s father testifies he heard his son’s voice on 911 call


Five of George Zimmerman’s friends, as well as some of his family members, have said that Zimmerman was the one screaming for help on the 911 call, but Trayvon Martin’s parents say the voice on the tape belongs to their son. Zimmerman has pleaded not guilty to second-degree murder. NBC’s Ron Mott reports.

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