Trayvon Martin's mother, Sybrina Fulton, says it was her son's voice heard screaming in the background of a 911 call.

The mother of Trayvon Martin testified Friday that it is the voice of her son heard screaming on a recorded 911 call during his confrontation with George Zimmerman, charged with second-degree murder in the death of the unarmed teenager.

Sybrina Fulton took the stand in Zimmerman's murder trial and said it is her son on the tape. Jahvaris Fulton then followed his mother on the stand and also testified that the screams belonged to his brother, Trayvon Martin.

Zimmerman, then 28, and Martin, 17, had a confrontation in a gated community in Sanford, Fla., on Feb. 26, 2012. Zimmerman said he shot Martin in self-defense when the teenager attacked him.

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