A photograph of George Zimmerman's head taken after the Feb. 26 shooting death of Trayvon Martin. It shows blood from injuries he Zimmerman says he received during their encounter. Florida State Attorney's Office/AFP/Getty Images hide caption

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NPR's Greg Allen reporting on 'Morning Edition'

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George Zimmerman during a court appearance on April 20. Gary W. Green/AP hide caption

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Cheryl Corley, reporting for the NPR Newscast

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George Zimmerman, in a 2005 mug shot provided by the Orange County (Fla.) jail, via The Miami Herald. He was arrested that year for an incident involving a dispute with a local alcohol control official. /AP hide caption

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