TODAY   |  June 23, 2013

Zimmerman judge bars expert testimony of 911 call

Opening statements begin in the murder trial of George Zimmerman Monday in the wake of a decision by the judge about screams heard on a 911 call the night Trayvon Martin was shot and killed. NBC's Ron Mott reports.

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>> in the murder trial of george zimmerman who shot and killed an unarmed teenager, trayvon martin martin . it comes after a key ruling by the judge in the case. ron mott is in sanford, florida. ron, good morning.

>> reporter: hey, lester, good morning to you. this was a highly anticipated ruling. the judge is not going to allow prosecution audio experts to testify at this trial but the 911 call itself can be played and ultimately the jury will decide who it thinks it hears screaming for help. today as lawyers wrap up preparations for monday's opening statements in a second-degree murder trial that could send george zimmerman to prison for the rest of his life --

>> he's exhausted. he's stressed.

>> reporter: zimmerman 's lead attorney says his client is tired but more than ready to clear his name.

>> even when he gets vindicated, he's not going to have the life he wants back. he's been put upon a lot of fre pressure about this case, other things outside the facts of the case. he's never going to be able to put that behind.

>> reporter: saturday the judge ruled in claiming zimmerman 's voice is not the one screaming on a 911 call and said they won't be able to testify in front of a jury.

>> so you think he's yelling help?

>> yes.

>> the state's experts don't even agree among themselves.

>> reporter: off and on for more than two weeks --

>> the same objection, your honor.

>> reporter: the two sides argued over the science.

>> it's possible that by avoiding days of dueling experts who might create more doubt than certainty, perhaps this is a blessing in disguise .

>> reporter: the judge wrote, quote, this order does not prevent the parties from playing the tapes at trial or 0 from calling witnesses familiar with the voice of the defendant or martin to testify regarding the identity of the person or persons making the scream. zimmerman has pled not guilty contending he shot and killed 17-year-old trayvon martin in self-defense. the judge is going to allow prosecutors to use the word profiling in this case a word they hoped to ban. they will not be allowed to say he was racially profiled.