More details emerge in Trayvon Martin investigation

By the CNN Wire Staff

(CNN) -- Trayvon Martin's girlfriend, talking to him on the telephone, heard the teenager saying "get off, get off," in the moments before his cell phone cut off and he was shot dead, according to a recording released Friday of the girl's interview with a prosecutor.
Another witness, however, seems to put Martin on top of George Zimmerman for at least part of the struggle, according to another recording.
"Where I first walked out there, the black guy was on top, and the only reason I can tell that was because the guy that was on the ground under him at that point wrestling was definitely a lighter color," the witness, whose name has not been made public, said in the interview.
    Martin was African-American. Zimmerman is a white Hispanic.
    Another witness said the heavier of the two appeared to be on top.
    "I know after seeing the TV of what's happening, comparing their pictures, I think Zimmerman was definitely on top because of his size," the witness said.
      The recordings provide the most detailed look yet into previously reported witness statements detailing the last moments of Martin's life.