Prosecutor John Guy argued that Zimmerman repeatedly lied about the shooting of the unarmed 17-year-old Martin.
His rebuttal came after defense attorney Mark O'Mara said prosecutors had failed to prove beyond a reasonable doubt that Zimmerman committed second-degree murder.
Jurors are taking a lunch break, and when they return Judge Debra Nelson will read them jury instructions.
The six jurors will then begin deliberations.

George Zimmerman arrives in court in Sanford, Fla., Friday morning. (AP photo)
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