Metro

Cop’s boyfriend killed in Brooklyn diner shooting

BROOKLYN HORROR: Jason Lewis (above), at the center of a surveillance video image, is about to be shot yesterday, allegedly by Tyrone Gainer in a Brooklyn diner. Moments later, he lay dying in his cop-girlfriend’s arms.

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Chilling surveillance video captures the exact moment that a cop’s boyfriend was fatally shot trying to defend her during a predawn fight in a Brooklyn diner yesterday.

Suspect Tyrone Gainer can be seen allegedly sneaking his handgun around an onlooker and into the gut of Jason Lewis — a cancer survivor and dad of three — mortally wounding him with a bullet to the stomach.

Lewis’ stricken off-duty-officer girlfriend later cradled her dying boyfriend in her arms, law-enforcement sources said.

The victim, 34, had been hanging out at his favorite haunt, the Country House Diner in Fort Greene, with his cop gal pal at around 5 a.m. when Gainer, 27, first entered with his 911-dispatcher girlfriend, sources said.

Gainer, who had just come from celebrating his birthday at a strip club, allegedly began harassing the off-duty female cop. The officer is the ex-lover of Gainer’s best friend, with whom she has a baby, sources said.

Gainer grabbed the woman’s arm and hissed, “Who you here with?’’ as she and Lewis stood at the counter waiting for food, sources said. Lewis calmly stepped in to try to defuse the situation, witnesses said.

“She’s with me now. Why don’t you relax? Why are you yelling? Leave her alone,” he told Gainer.

The rookie cop then went out to move Lewis’ illegally parked car. She said that when she came back in, she saw the men arguing and heard a pop but didn’t see a gun, sources said.

She didn’t realize that Lewis had been hit. He walked with her outside before collapsing on the sidewalk, sources said.

She comforted the dying man in her arms until he was rushed to Brooklyn Hospital, where he was pronounced dead.

Gainer allegedly tried to flee after the shooting, but a friend of Lewis’ chased him down and held him until cops arrived.

Gainer was charged with murder and criminal possession of a weapon. He has previously been busted at least four times, including once for allegedly menacing a cop.

Sources said his girlfriend tossed the .22-caliber gun — which was silver with a wooden handle — beneath a car but it was quickly located by detectives. It was unclear whether she would face charges.

Devastated friends of Lewis, who owned a fleet of dollar vans, said he had just started dating the cop in recent months. He had 6- and 10-year-old sons and a 14-year-old daughter.

Additional reporting by C.J. Sullivan, Kevin Sheehan and Selim Algar