Witnesses for both sides of the George Zimmerman trial testified regarding whose voice they think is heard in the background of a 911 call made the night of Trayvon Martin's death.
Watch more: Whose voice is screaming 'help' in the 911 call?
George Zimmerman is charged with second-degree murder for killing Trayvon Martin on Feb. 26, 2012. Zimmerman says he shot the teenager in self-defense.
There's still a lot of confusion regarding what was going on in the background of a 911 call made by a neighbor. You can hear someone yell "help" in the background of the call, but the identity of the voice has not been confirmed. Vinnie Politan goes through what key witnesses have said about whose voice they think is screaming for help and how this 911 call may influence the case.