Zimmerman: O’Mara admits he cannot prove defendant utters terrified shriek

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Cries for help: Is it Zimmerman or Trayvon?

 Trayvon Martin | See all 221 items

 By Amanda Sloane

updated 3:37 PM EDT, Tue April 30, 2013

NEED TO KNOW

• Defense attorney Mark O'Mara says 911 call is 'the most significant piece of evidence in the trial'
• George Zimmerman is charged with second-degree murder for shooting Trayvon Martin on Feb. 26, 2012. He claims he shot the teenager in self-defense 

• George Zimmerman attorneys: State voice experts may be using phony science