An officer at the scene overheard Zimmerman saying, "I was yelling for someone to help me but no one would help me," the report said.
Witnesses told ABC News they heard Zimmerman pronounce aloud to the breathless residents watching the violence unfold "it was self-defense," and place the gun on the ground.
But after the shooting, a source inside the police department told ABC News that a narcotics detective and not a homicide detective first approached Zimmerman. The detective pepppered Zimmerman with questions, the source said, rather than allow Zimmerman to tell his story. Questions can lead a witness, the source said.
Another officer corrected a witness after she told him that she heard the teen cry for help.
The officer told the witness, a long-time teacher, it was Zimmerman who cried for help, said the witness. ABC News has spoken to the teacher and she confirmed that the officer corrected her when she said she heard the teenager shout for help.
The Sanford Police Department refused to release 911 calls by witnesses and neighbors.
Several of the calls, ABC News has learned, contain the sound of the single gunshot.
Lee publically admitted that officers accepted Zimmerman's word at the scene that he had no police record.
Two days later during a meeting with Trayvon's father Tracy Martin, an officer told the father that Zimmerman's record was "squeaky clean."
Yet public records showed that Zimmerman was charged with battery against on officer and resisting arrest in 2005, a charge which was later expunged.
Zimmerman has not responded to requests for a comment.
"I asked [the police] well did you check out my son's record?" Tracy Martin told ABC News in an interview Sunday. "What about his?...Trayvon was innocent."
