Published: Mar 18, 2013 1:03 PM EDT

ORLANDO, Fla. (AP) - George Zimmerman's attorney is again asking to take the deposition of a lawyer who interviewed a teenager who says she was on the phone with Trayvon Martin moments before he was shot by the neighborhood watch leader, according to court filing made public Monday.
    
Attorney Mark O'Mara said that new evidence has come out since a judge earlier denied a motion that would have allowed Zimmerman's legal team to depose lawyer Ben Crump, who interviewed the teen known as "Witness 8" shortly after Martin's death in February 2012.
    
The new evidence includes an admission by prosecutors that the teen lied when she said she had been so distraught over Martin's death that she was hospitalized and couldn't attend his funeral. O'Mara said that lie raises questions about the truthfulness of other parts of her testimony. The teen is considered one of the prosecution's most important witnesses.
    
"Now that Witness 8's credibility is at issue because of this contradictory and possibly perjurious testimony, deposing Mr. Crump is even more necessary and relevant for further determination of additional misrepresentations or lies," the court filing said.
    
Martin was fatally shot by Zimmerman during a confrontation a year ago at a gated community in the Orlando suburb, Sanford. Zimmerman is pleading not guilty to second-degree murder, claiming self-defense. His trial is set for June.
    
A month-and-a-half delay in Zimmerman's arrest led to nationwide protests.

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