A 67-year-old Queens man who shot and killed an ex-con trying to rob him two years ago and had an arsenal of firearms in his apartment pleaded guilty Thursday with the understanding that he would be sentenced to four years in prison, prosecutors said.

Charles Foehner pleaded guilty to criminal possession of a weapon in the second degree during a brief court appearance.

He was facing 25 years in prison if he went to trial, his attorney, Thomas Kenniff, told the Daily News.

Foehner was accused of gunning down Cody Gonzalez, who waved a sharp object — later determined to be a pen — after approaching him outside his Kew Gardens apartment building around 2 a.m. on May 31, 2023, and demanding his cash and cigarettes, police said.

He called 911 after shooting Gonzalez and, when questioned

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