Two bombshell moments in the George Zimmerman murder trial:
Two police officers testified that Tracey Martin said to them that the voice crying for help on that 911 call the night Martin was shot was not his voice.
Zimmerman's attorney's called Tracey to the stand and Martin differ with the police officers accounts.
"My response was, I didn't tell him that I didn't know, I didn't tell him no, that wasn't Travyon, " Martin said.
OutFront tonight: Natalie Jackson, attorney for Trayvon Martin's family.