Opening statements begin Monday in the trial of George Zimmerman, the neighborhood watch volunteer accused of murdering 17-year-old Trayvon Martin.
The case gained national attention in February 2012, when police initially failed to arrest Zimmerman due to Florida's controversial "stand your ground law." Zimmerman claimed he shot an unarmed Martin in self defense.
Much of what happened on that night is still a mystery, but one key piece of evidence is a 911 call made by a witness. During the call a voice can be heard yelling help, as shots are fired.
Zimmerman's defense team scored a victory this weekend when the judge in the case made a ruling on who can testify about the voice heard yelling for help during the call. The state had lined up expert witnesses to testify that it was Martin's voice yelling for help, but the defense claims it's the other way around.
On Saturday, the judge ruled the experts will not be allowed to testify, and said the science the experts used to determine who was calling for help was unreliable.
Six jurors, all women, will have to make that decision on their own.
The jurors in the case will spend the rest of the trial sequestered in a local hotel. It could take a month or more for both sides to present their case and the jury to reach a decision
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