The shooting took place in Lawrence Township around 12:25 a.m. Tuesday.
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Authorities say no other injuries were reported.
The man's name has not been released.
Investigators say someone opened fire, possibly inside the restaurant.
Police are searching for the driver of a black Chevy Suburban who took off after the shooting.
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Detectives and the Mercer County Prosecutor's Office remain at the scene as the investigation continues.
(The Associated Press contributed to this report.)
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