UPDATE: Defense says prosecutors didn't prove their case

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SANFORD, Fla. (AP) - George Zimmerman's lawyer is telling jurors that the prosecution hasn't proven Zimmerman guilty beyond a reasonable doubt.

Jurors may start considering later today whether Zimmerman is guilty of second-degree murder or manslaughter in the shooting death of Trayvon Martin. Zimmerman says he acted in self-defense.

His lawyer, in closing arguments today, said prosecutors had built a case on a series of hypothetical "could've beens" and "maybes."

Yesterday, prosecutors made the case that Zimmerman assumed Martin was a criminal up to no go when he confronted him in his neighborhood. A scuffle followed, and Zimmerman fired his gun.

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