Sybrina Fulton, mother of Trayvon Martin. Paul J. Richards /AFP/Getty Images hide caption

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George Zimmerman, who is charged with second-degree murder in the death of Trayvon Martin, at a court hearing last June in Seminole County, Fla. Joe Burbank/Orlando Sentinel/pool/Getty Images hide caption

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George Zimmerman, who is charged with second-degree murder in the death of Trayvon Martin, at a court hearing last June in Seminole County, Fla. Joe Burbank/Orlando Sentinel/pool/Getty Images hide caption

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Defense attorney Mark O'Mara (left) with his client, George Zimmerman, at an April hearing related to second-degree murder charges in the killing of Trayvon Martin in Sanford, Fla. Pool/Getty Images hide caption

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A handout composite provided by the Seminole County Sheriff's Office, showing George Zimmerman in new mugshot photos. Seminole County (Fla.) Sheriff's Office/Getty Images hide caption

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George Zimmerman during his bond hearing in a Seminole County, Fla., courtroom on April 20. Gary Green/Orlando Sentinel-Pool/Getty Images hide caption

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