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FILE - This undated file family photo shows Trayvon Martin. The Sanford police department released a video Thursday, March 29, 2012, showing George Zimmerman being escorted into the Sanford police station in handcuffs on Feb. 26, 2012, the night he fatall Associated Press
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In this image taken from video at the Sanford, Fla., Police Department, George Zimmerman, in red jacket, is escorted into the Sanford police station in handcuffs on Feb. 26, 2012, the night he fatally shot Trayvon Martin. (AP Photo/Sanford Police Departme Associated Press
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In this image taken from video at the Sanford, Fla., Police Department, George Zimmerman, in red jacket, is escorted into the Sanford police station in handcuffs on Feb. 26, 2012, the night he fatally shot Trayvon Martin. Sanford Police Department, Associated Press
By Deseret News, Mark Strassmann, cbsnews

(CBS News) SANFORD, Florida - The defense of George Zimmerman rests on a violent fight that he said occurred before he fired the shot that killed Trayvon Martin.

Zimmerman is neighborhood watch volunteer at the center of the case. It was almost five weeks that Martin, the unarmed 17-year-old, was killed after Zimmerman found him suspicious. We don't know what happened immediately immediately before the shot was fired. CBS News correspondent Mark Strassman has new evidence in the case.

Trayvon Martin was buried in Miami with a gunshot wound to his chest. But otherwise, according to Richard Kurtz, the funeral director who prepared Martin for burial, his body showed no injuries.

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