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A 25-year-old ex-con was shot to death outside a Queens deli during an argument with his killer, police said Tuesday.

Joseph Valdez got into an quarrel with a man who pulled out a gun and opened fire outside the store on 21st St. near 41st Ave. in Astoria about 10 p.m. Monday, cops said. Valdez suffered three gunshot wounds to the arm and upper body.

Medics rushed Valdez to New York-Presbyterian Hospital Weill Cornell, but he could not be saved.

The gunman ran off and is being sought.