George Zimmerman allegedly threatened to kill a man in Florida earlier this week during a road rage incident ... and cops pulled over Zimmerman to grill him about it.
According to the Lake Mary PD, a man named Matthew Apperson called 911 on September 9 and told the operator Zimmerman had pulled up next to him and began yelling, "Why are you pointing your finger at me? I f***ing kill you. Do you know who I am?"
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