SANFORD, Fla. (AP) -- The wife of George Zimmerman's best friend has taken the witness stand at his second-degree murder trial.
Sondra Osterman was called by Zimmerman's defense attorneys Monday to identify his voice on a 911 call.
She is the third witness since the defense began its case last Friday to testify that Zimmerman is screaming for help on the 911 call.
The 911 call captured the confrontation between Zimmerman and 17-year-old Trayvon Martin shortly before Zimmerman fatally shot Martin.
Zimmerman is pleading not guilty, claiming he acted in self-defense.
Zimmerman's family and friends claim its Zimmerman screaming, while Martin's parents say the voice is that of their son.