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SANFORD (CBSMiami) — A man who got into a road rage incident with George Zimmerman and shot at his vehicle has been sentenced to 20 years in prison.

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At the sentencing hearing Monday morning, Zimmerman said 38-year-old Matthew Apperson showed no regard for human life during the May 2015 confrontation, and even seemed joyful because he mistakenly thought he’d killed him.

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Apperson was convicted by a Seminole County jury last month of attempted second-degree murder, armed aggravated assault and shooting into a vehicle. Apperson testified at trial that he acted in self-defense after Zimmerman flashed a gun. Zimmerman disputed that.

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Zimmerman is the former neighborhood watch volunteer who was acquitted of second-degree murder after fatally shooting unarmed teenager Trayvon Martin in 2012.