Before being killed in a shootout that wounded an NYPD officer, a Brooklyn army veteran ambushed his neighbor, shooting him just moments after the victim stepped out of a car to return home, chilling video obtained by the Daily News shows.

Gunman Dashawn Larode was lying in wait in the vestibule of his apartment building before stepping out and fatally shooting 41-year-old Leroy Wallace about 5:30 a.m. Monday, the video shows.

Wallace was shot nine seconds after he stepped out of the car that dropped him off, the video shows. After shooting the victim once, Larode, 24, can be seen pumping the shotgun as he descends the front steps before shooting Wallace as he lay on the ground.

The video footage comes as family members question the mental state of Larode, a former Army specialist s

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