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Help? >> yes. >> what is your -- >> reporter: after a single gunshot is heard on the tape, the screaming suddenly stops. >> i don't hear him yelling anymore. do you hear anything? >> no, i don't because i'm hiding upstairs. there was a gun shout outside the house. >> reporter: prosecutors say those screams came from an unharmed teenager fighting for his life. >> i have an exempt from zimmerman from the rean accountment. the screams tonight match at all so it tells me, it's not george zimmerman of the screams. >> reporter: the defense says the state's expert is relying on unproven science, inst...

The screams tonight match at all so it tells me, it's not george zimmerman of the screams. >> reporter: the defense says the state's expert is relying on unproven science, instead defense attorneys point to the testimony of an fbi speech scientists who told the court with current technology it's not possible to determine whether the voice on the tape belongs to trayvon martin or george zimmerman. the speech scientists said with three seconds of uninterrupted screaming on the 911 call, there is no way to know for sure. >> we determined that screaming was not normal. it was by someone who was fa...

Zimmerman. the speech scientists said with three seconds of uninterrupted screaming on the 911 call, there is no way to know for sure. >> we determined that screaming was not normal. it was by someone who was facing probably imminent threat of death or something. very difficult to analyze. >> reporter: still, the neighbor who made the 911 call told "ac 360" she believes it was trayvon martin screaming for help that night. >> i definitely could tell it was a younger youthful voice than it was the deep voice that i heard when they were arguing, and i heard them outside my window. >> reporter: tr...

Zimmerman from the reenactment. the screams tonight match at all so it tells me, it's not george zimmerman of the screams. >> reporter: the defense says the state's expert is relying on unproven science, instead defense attorneys point to the testimony of an fbi speech scientists who told the court with current technology it's not possible to determine whether the voice on the tape belongs to trayvon martin or george zimmerman. the speech scientists said with three seconds of uninterrupted screaming on the 911 call, there is no way to know for sure. >> we determined that screaming was not norm...