A man with a significant mental health history armed with a realistic-looking BB gun was fatally shot by an off-duty police officer outside a popular Staten Island diner on Friday night, according to sources and the NYPD.

Bullets flew just after 8 p.m. at the well-known Andrew’s Diner on Hylan Boulevard in Eltingville, according to the NYPD.

Diners alerted cops that a man with a gun was menacing the eatery, according to sources.

The gun-wielding man — whom sources identified as Jesse Campbell, 44 — then had a confrontation with two off-duty NYPD officers outside the diner, during which he pointed the supposed weapon at them, according to sources.

A gun-wielding man was fatally shot by police after raising a weapon at them. Wayne Carrington

Police have not yet confirmed the man’s nam

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