Zimmerman, 29, has pleaded not guilty to second-degree murder.
Prosecutors contend that Zimmerman was profiling Martin and perceived the teen as someone suspicious in the neighborhood, which had been the site of a series of break-ins. Martin was there visiting his father and his father's fiancee. The case sparked protests because police did not charge Zimmerman for 44 days and it touched off a nationwide debate about race and self-defense.
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