SANFORD, Fla. The former Sanford police chief who lost his job during the fallout from Trayvon Martin's fatal shooting is on the witness stand at George Zimmerman's trial.
Bill Lee was called to the witness stand by the defense on Monday to testify about a 911 call in which screams can be heard in the background.
The call captured audio of the fight between Martin and George Zimmerman. Zimmerman is pleading not guilty to second-degree murder, claiming self-defense.
Convincing the jury of whose voice is on the tapes is important to both sides because it would help jurors decide who was the aggressor in the confrontation that left Martin dead.
Relatives of Martin's and Zimmerman's have offered conflicting opinions on previous days about who is heard screaming.