Trayvon Martin’s mother: ‘I heard my son screaming’

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A key piece of evidence was at the center of George Zimmerman’s murder trial Friday.

Trayvon Martin’s mother and brother listened in court to a 911 call on the night of the shooting and said they recognized the screaming on the recording as coming from the slain teen.

Zimmerman is charged with second-degree murder. His defense team argues that he shot the teen in self-defense.

Lawyers on both sides want to convince the jury of who was doing the screaming, Zimmerman or Martin.