"SANFORD, Fla. (AP) -- George Zimmerman's best friends and a former co-worker took the witness stand Monday at his second-degree murder trial to testify that it's Zimmerman's voice screaming for help on a 911 call and not that of 17-year-old Trayvon Martin.

The three friends joined a series of witnesses called by the defense who have testified that Zimmerman is screaming for help on the 911 call moments before he fatally shot Martin.

After the call was played for Sondra Osterman in the courtroom, defense attorney Mark O'Mara asked who it was.

"Yes, definitely. It's Georgie," said Sondra Osterman, who testified she first met Zimmerman in 2006 while working with him at a mortgage company. Sondra Osterman and her husband, Mark, describe themselves as the best friends of Zimmerman and his wife."


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