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Judge Debra Nelson listens to testimony from forensics animation expert Daniel Shoemaker, in the courtroom for the 21st day of the George Zimmerman trial in Seminole circuit court, in Sanford, Fla., Tuesday, July 9, 2013. Zimmerman is charged with 2nd-degree murder in the fatal shooting of Trayvon Martin, an unarmed teen, in 2012. (Joe Burbank/Orlando Sentinel/POOL)
Judge Debra Nelson listens to testimony from forensics animation expert Daniel Shoemaker, in the courtroom for the 21st day of the George Zimmerman trial in Seminole circuit court, in Sanford, Fla., Tuesday, July 9, 2013. Zimmerman is charged with 2nd-degree murder in the fatal shooting of Trayvon Martin, an unarmed teen, in 2012. (Joe Burbank/Orlando Sentinel/POOL)

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Erin Burnett talks to Natalie Jackson, atty. for the Trayvon Martin family about closing arguments in Zimmerman trial.