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UNDERCOVER NARC KILLS VET WHO STUMBLED ON STAKEOUT

An undercover narcotics cop shot dead an Army veteran and father of two in Brooklyn last night after the men got into a struggle, police sources said.

Shem Walker, 49, walked out of his family’s home on Lafayette and Classon avenues in Fort Greene shortly after 8 p.m. and confronted the plainclothes officer from the Brooklyn North Narcotics squad, who was listening in on a drug buy in the area.

It’s unclear what Walker said, but the cop, who’s been working undercover for less than three years, ignored him.

Walker, who lives in Pennsylvania but was in town visiting his sick mom, Lydia, started hitting the cop, sources said.

They wrestled and fell to the ground. But the cop broke free, took out his gun and shouted “Police!” before firing twice, the sources said.

Walker, who occasionally does maintenance work at the building, was hit once in the head and the chest.

“We heard a low mumbling sound, like someone was talking to someone,” said witness Vivian Lee, 43. “Then we heard ‘No, don’t!’ and then we heard a gun shot.”

Walker, who was stationed in Germany when he was in the military, was rushed to Brooklyn Hospital where he died.

“He’s the greatest guy in the world,” his heartbroken brother, Patrick Nurse, said.

“He’s loving and kind, very soft-spoken,” added a cousin Patricia Welcome.

She said Walker’s wheelchair-bound mother, who suffers from several ailments and had a leg amputated, is “completely devastated.”

One of Walker’s daughters was also in the military and has served in the Iraq war.

Internal Affairs cops and the Brooklyn DA’s office are investigating the shooting.