George Zimmerman in court

AP Photo/Orlando Sentinel, Joe Burbank, Pool

George Zimmerman, left, sits in Seminole circuit court with co-counsel Don West, during a pre-trial hearing, in Sanford, Fla., Thursday, June 6, 2013. Zimmerman is charged with second-degree murder in the 2012 shooting death of Florida teen Trayvon Martin. He is pleading not guilty, claiming self-defense.

George Zimmerman arrives in Seminole circuit court for a hearing, in Sanford, Fla., Thursday, June 6, 2013. A Florida judge has denied a defense request to let a handful of witnesses testify confidentiality during Zimmerman's trial for fatally shooting Trayvon Martin. Zimmerman is pleading not guilty, claiming self-defense.

George Zimmerman talks to his attorney, Mark O'Mara, in Seminole circuit court, in Sanford, Fla., Thursday, June 6, 2013. A judge denied a defense request to let a handful of witnesses testify confidentialiy during Zimmerman's trial for fatally shooting Trayvon Martin. Zimmerman is pleading not guilty, claiming self-defense.

Defense attorney Mark O'Mara, left, and prosecutor Bernie de a Rionda are in Seminole circuit court, in Sanford, Fla., during a pre-trial hearing for George Zimmerman, Thursday, June 6, 2013. A judge denied a defense request to let a handful of witnesses testify confidentialiy during Zimmerman's trial for fatally shooting Trayvon Martin. Zimmerman is pleading not guilty, claiming self-defense.

George Zimmerman, left, talks with co-counsel Don West during a hearing in Seminole circuit court, in Sanford, Fla., Thursday, June 6, 2013. A Florida judge has denied a defense request to let a handful of witnesses testify confidentiality during Zimmerman's trial for fatally shooting Trayvon Martin. Zimmerman is pleading not guilty, claiming self-defense.

Robert Zimmerman Jr., left, the brother of George Zimmerman, the accused shooter of Trayvon Martin, talks with defense attorney Mark O'Mara, during a pre-trial hearing, Tuesday, May 28, 2013 in Sanford, Fla. George Zimmerman has been charged with second-degree murder for the 2012 shooting death of Trayvon Martin. He was not in court for the hearing.

Defense attorney Mark O'Mara hands Circuit Judge Debra Nelson a document during a pre-trial hearing for George Zimmerman, the accused shooter of Trayvon Martin, Tuesday, May 28, 2013 in Sanford, Fla. Nelson ruled to limit what attorneys can say in their opening statement at Zimmerman's trial. Attorneys won't be able to mention Trayvon Martin's drug use, suspension from school and past fighting during opening statements. Nelson also refused to allow jurors to travel to the shooting scene during trial, and rejected a defense request to delay the trial set to begin June 10. Zimmerman has been charged with second-degree murder for the 2012 shooting death of Trayvon Martin. He was not in court for the hearing.

Benjamin Crump, center, attorney for Trayvon Martin's family, speaks to members of the media after a hearing for George Zimmerman with Marion Evans, left, Trayvon Martin's grandmother and Sybrina Fulton, right, Trayvon Martin's mother, at the Seminole County Criminal Justice Center, Tuesday, May 28, 2013, in Sanford, Fla. Zimmerman has been charged with second-degree murder for the 2012 shooting death of Trayvon Martin.

Mark O'Mara, center, attorney for George Zimmerman, arrives for a hearing at the Seminole County Courthouse, Thursday, June 6, 2013, in Sanford, Fla. Zimmerman has been charged with second-degree murder for the 2012 shooting death of Trayvon Martin.

Sybrina Fulton, the mother shooting victimTrayvon Martin, sits with with her attorney Benjamin Crump, during a pre-trial hearing for George Zimmerman, the accused shooter of Trayvon Martin, Tuesday, May 28, 2013 in Sanford, Fla. Zimmerman has been charged with second-degree murder for the 2012 shooting death of Trayvon Martin. He was not in court for the hearing.

Robert Zimmerman, Jr., the brother of George Zimmerman, sits in Seminole circuit court, in Sanford, Fla., during a pre-trial hearing for his brother, Thursday, June 6, 2013. A Florida judge has denied a defense request to let a handful of witnesses testify confidentiality during Zimmerman's trial for fatally shooting Trayvon Martin. Zimmerman is pleading not guilty, claiming self-defense.