Jul 8, 2013 2:18 PM by Associated Press
SANFORD, Fla. (AP) - The lead detective in George Zimmerman's second-degree murder case says Trayvon Martin's father told him that screams for help on a 911 call weren't his son's.
Officer Chris Serino was called by the defense Monday to testify about a meeting with Martin's father in the days after the Miami teen was fatally shot by Zimmerman.
Serino says at the meeting, when Tracy Martin listened to the 911 recording and was asked if it was his son, Tracy Martin said "no."
Tracy Martin was in the courtroom Monday as Serino recounted the meeting.
Convincing the jury of whose voice is on the tapes is important because it would help them decide who was the aggressor in the confrontation. Relatives of Martin's and Zimmerman's have offered conflicting opinions about who is heard screaming.
Zimmerman is pleading not guilty to second degree murder, claiming self-defense.
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