George Zimmerman, defendant in the killing of Trayvon Martin, at an April 30 court hearing in Sanford, Fla. Joe Burbank/pool/Getty Images hide caption

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An image taken from fired police sergeant Ron King's video statement, in which he defends himself for bringing silhouette targets resembling the hoody-wearing image of Trayvon Martin. YouTube hide caption

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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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