With the Trayvon Martin trial set to begin on Monday, one question remains on the country's mind and simultaneously presents a monumental challenge to both the prosecution and the defense: whose voice is screaming for help on the 911 call?
Since the chilling 911 calls were released to the public last year, a number of experts have debated whether or not the screams are coming from the 17-year-old Martin or his alleged killer, George Zimmerman, making it an integral piece of evidence in the trial.
Now, ABC News has exclusively obtained audio that both the defense and prosecution possess, featuring Martin's voice, which could be the key to answering the longstanding question of who was, in fact, begging for help the night of the fatal confrontation.
During the final hearing before the trial begins, Judge Debra Nelson heard testimony about whether or not a voice recognition expert will be allowed to testify. While testifying for the defense, FBI voice expert Hirotaka Nakasone said there wasn't enough clear sound on the 911 recording to determine whose voice it was.
Audio expert Alan Reich, who has spoken on behalf of the state, has said he heard Trayvon Martin saying, "I'm begging you," after analyzing the recording. Another expert, Tom Owen, who testified for the prosecution Friday said he did not believe the screams were Zimmerman's.
"It is much easier to eliminate someone than identify someone," said Owen. "The screams don't match at all with Zimmerman's samples."
Owen, who compared Zimmerman's reenactment of the scene to the 911 audio, did not have access to the Martin recording at the time.
ABC News sent the audio of Martin's voice to a forensic analyst who said the screams on the 911 call are more likely Zimmerman. He added, however, that because the sound is so muffled with only two seconds of unobscured audio, there could be no definitive identification of "the screamer."
Martin's family lawyer, Benjamin Crump, spoke with HuffPost Live's Marc Lamont Hill Friday, addressing how the family was coping with both the death of their son and the attack on his character.
"The best thing that could be said is they're taking it day to day," Crump said. "They have continued their faith in God and ask for prayer, because when you really think about it, nothing can prepare you for a tragedy like this to lose your child in such an unbelievable manner."
Earlier this week, an attorney from Crump's firm accused Zimmerman's lawyer, Mark O'Mara, of fabricating evidence after falsely claiming a video showed Martin's friends beating up a homeless man.
"It's the old strategy of vilify the victim to try to justify the heinous act of the defendant," Crump said.
Crump also went on to confront the controversy surrounding the photos circulating of Martin, with critics accusing media outlets of only showing the teen as a young boy. However, Crump said some of the photos were taken only two weeks before the shooting.
Watch Crump's full interview with HuffPost Live in the clip below.