TODAY   |  July 09, 2013

Trayvon Martin’s dad: That’s Trayvon on 911 call

In court on Monday, Trayvon Martin’s father testified that he believes that the voice calling out for help on the 911 call recorded the night Trayvon was killed is his son’s, not George Zimmerman’s; Zimmerman’s friends maintain it is Zimmerman’s voice. NBC’s Kerry Sanders reports and NBC legal analyst Lisa Bloom comments on the case.

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This content comes from Closed Captioning that was broadcast along with this program.

>> we'll begin this half hour with a key decision by the judge in the george zimmerman murder trial. kerry sanders is covering the trial for us. he is at the courthouse once again. good morning to you.

>> reporter: good morning savannah. when 17-year-old trayvon martin was shot and killed by george zimmerman a medical examiners report showed he had thc in his system. that's the active chemical in marijuana. today the defense plans to present that information to the jury. this is the case that's now days away from wrapping up and the question is still being asked, whose voice is that screaming for help on that 911 call. in court monday, trayvon martin's father tracy martin says he believes his son was screaming for help on the 911 call.

>> sow think he's yelling help?

>> yes.

>> reporter: but police detective chris serino testified he got a different answer when he asked whose voice was that. i asked if that was his son yelling for help.

>> what was his response?

>> he was -- it was more of a verbal and nonverbal. he looked away, and under his breath, as i interrupted it said no.

>> tracy martin says he didn't say it that way.

>> i didn't tell him no that wasn't trayvon. i pushed away from the table and just kind of shook my head and said i can't tell.

>> the prosecutor asked tracy martin what was going through his mind when he heard the 911 call.

>> i was listening to my son's last cry for help. i was listening to his life being taken. and i was coming trying to come to grips that trayvon was here no more.

>> the defense called five of george zimmerman 's friends. each was asked who was screaming for help on the call.

>> george .

>> yeah, definitely george .

>> george zimmerman 's voice.

>> i thought it was george .

>> there's absolutely no doubt in my mind that is george zimmerman .

>> john donnelly told the court zimmerman is like a son to him.

>> you would agree there's a bias there on your behalf of george zimmerman , correct? because of your friendship.

>> he is my very dear friend.

>> george zimmerman has pled not guilty to second degree murder. he says he shot trayvon martin in self-defense. savannah.