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Several witnesses in the George Zimmerman trial have testified that screams for help captured by a call to police just as Trayvon Martin was shot and killed came from George Zimmerman.

The defense began calling witnesses on July 5 after the state rested its case, and so far seven have told the court that they hear Zimmermanโ€™s voice screaming for help. These witnesses have included Zimmermanโ€™s mother, who testified Friday, as well as other close friends and co-workers.

Today, defense attorney Mark Oโ€™Mara played the recording of the 911 call between one of Zimmermanโ€™s neighbors and the police today and asked Leanne Benjamin, a business associate of Zimmermanโ€™s, if she recognized the voice screaming for help.

โ€œYes I do,โ€ said Benjamin, โ€œ[itโ€™s] George Zimmermanโ€™s voice.โ€ She explained, โ€œI know what his voice sounds like when he gets excited or loudโ€ because of their experience working together on political campaigns. Benjamin is close friends with Zimmerman, and she and her husband have contributed $2,500 to him since the investigation began.

Last week the prosecution brought forth witnesses who testified that the screams belong to Trayvon Martin. Sybrina Fulton, Martinโ€™s mother, told jurors, โ€œI heard my son screaming.โ€

Earlier, an FBI audio specialist testified that the callโ€™s quality is too poor to definitively identify who is screaming. Zimmerman told police that he was pinned down by Martin and was calling out for help, a significant part of his self-defense narrative.