Attorneys for George Zimmerman want all of ABC News' recordings and materials from an interview Trayvon Martin family attorney Benjamin Crump conducted with a witness in last year's shooting of the unarmed teen.

Zimmerman’s attorneys were given a recording of the interview with Martin's girlfriend, who is known as Witness 8, but they expressed concerns about the accuracy of it. Martin's girlfriend was allegedly on the phone with the 17-year-old, just moments before he was shot and killed.

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Defense attorneys filed a motion last week asking for all records and information from Crump's interviews of Witness 8 in March 2012. The motion claims Crump organized the interview with the witness before police knew she had any relevance to the case. 

ABC News was present for Crump's interview with the girl and defense attorney Mark O’Mara wants the network's complete materials from that interview. The phone call which led to the recording was over 26 minutes long, but the recording provided was only 12 minutes and 44 seconds, leaving half the conversation unaccounted for, he says. 

O’Mara claims the recording has obvious edit indicators, such as stops and starts. He says sounds on the recording suggest it’s not an original copy but a recording of a recording.

Zimmerman has pleaded not guilty to a second-degree murder charge for shooting Martin on February 26. Martin was returning from a convenience store and was unarmed. Zimmerman told police he shot the teen in self-defense.