George Zimmerman

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Sybrina Fulton, the mother of Trayvon Martin, takes the stand during George Zimmerman's trial in Seminole County circuit court in Sanford, Fla., on July 5, 2013. Zimmerman has been charged with second-degree murder for the 2012 shooting death of Martin. (Associated Press/Orlando Sentinel)

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Prosecutor Bernie de la Rionda (right) demonstrates a possible scenario while questioning state's witness Chris Serino, a Sanford police officer, during the George Zimmerman trial in Seminole circuit court in Sanford, Fla., on July 2, 2013. Zimmerman has been charged with second-degree murder for the 2012 shooting death of Trayvon Martin. (Associated Press/Orlando Sentinel)

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George Zimmerman (right) and defense attorney Don West arrive for the 16th day of Mr. Zimmerman's trial in Seminole Circuit Court in Sanford, Fla., on Monday, July 1, 2013. Mr. Zimmerman is charged with second-degree murder in the 2012 shooting death of Trayvon Martin. (AP Photo/Orlando Sentinel, Joe Burbank, Pool)

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Don West (right), George Zimmerman's defense attorney, presents state witness Hirotaka Nakasone (left), a senior voice recognition scientist with the FBI, with a marked exhibit as Mr. Nakasone testifies in Mr. Zimmerman's trial in Seminole Circuit Court in Sanford, Fla., on Monday, July 1, 2013. Mr. Zimmerman is charged with second-degree murder in the 2012 shooting death of Trayvon Martin. (AP Photo/Orlando Sentinel, Joe Burbank, Pool)

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George Zimmerman (center) arrives for the 15th day of his trial in Seminole circuit court in Sanford, Fla., on June 28, 2013. Zimmerman has been charged with second-degree murder for the 2012 shooting death of Trayvon Martin. (Associated Press/Orlando Sentinel)

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Witness Rachel Jeantel continues her testimony during George Zimmerman's trial in Seminole circuit court in Sanford, Fla. Thursday, June 27, 2013. Zimmerman has been charged with second-degree murder for the 2012 shooting death of Trayvon Martin.(AP Photo/Orlando Sentinel, Jacob Langston, Pool)

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Prosecution witness Rachel Jeantel listens as defense attorney Don West questions her during her testimony in George Zimmerman's trial in Seminole Circuit Court in Sanford, Fla., on Wednesday, June 26, 2013. Mr. Zimmerman is charged with second-degree murder in the 2012 shooting death of Trayvon Martin. (AP Photo/Orlando Sentinel, Jacob Langston, Pool)

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George Zimmerman (left) talks with defense attorney Mark O'Mara during the former's trial in Seminole Circuit Court in Sanford, Fla., on Tuesday, June 25, 2013. Mr. Zimmerman has been charged with second-degree murder in the 2012 shooting death of Trayvon Martin. (Gary W. Green/Orlando Sentinel)