Sanford police officer Ricardo Ayala describes the fatal chest wound that he observed on Trayvon Martin, during the 15th day of the George Zimmerman trial in Seminole circuit court, in Sanford, Fla., Friday, June 28, 2013. Zimmerman has been charged with second-degree murder for the 2012 shooting death of Trayvon Martin.(AP Photo/Orlando Sentinel, Joe Burbank, Pool)

Associated Press
Sanford police officer Ricardo Ayala describes the fatal chest wound that he observed on Trayvon Martin, during the 15th day of the George Zimmerman trial in Seminole circuit court, in Sanford, Fla., Friday, June 28, 2013. Zimmerman has been charged with second-degree murder for the 2012 shooting death of Trayvon Martin.(AP Photo/Orlando Sentinel, Joe Burbank, Pool)
Sanford police officer Ricardo Ayala describes the fatal chest wound that he observed on Trayvon Martin, during the 15th day of the George Zimmerman trial in Seminole circuit court, in Sanford, Fla., Friday, June 28, 2013. Zimmerman has been charged with second-degree murder for the 2012 shooting death of Trayvon Martin.(AP Photo/Orlando Sentinel, Joe Burbank, Pool)
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