The shooting happened just after 10:30 p.m. Sunday in the parking lot of a Buffalo Wild Wings in Wallkill, in Orange County.
Police say the officer, 36-year-old Sean Armstead, of Port Jervis, suspected the victim was having an affair with his wife or girlfriend.
That victim was identified as 20-year-old Edward Wilkins, of Wurtsboro
Both were pronounced dead at the scene.
Armstead was assigned to PSA 8 in the Bronx.
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