SOUTHBURY — A Southbury resident shot a knife-wielding man who tried to mug him Monday in New Haven's well-known Wooster Square neighborhood, police said.

William Kiselewsky, 65, of 207 Hulls Hill Road, was eating lunch on Wooster Place by a church, near where he works, on Monday afternoon when a man identified as Hector Santiago, 40, of New Haven, approached him with a knife. Santiago threatened to kill him and demanded money, said Officer Joe Avery.

Kiselewsky drew a handgun and shot Santiago twice in the chest before putting the gun down and calling 911 on his cell phone, police said.

Santiago was taken to Yale-New Haven Hospital, where a hospital spokeswoman said he was in fair condition Tuesday. Avery said Santiago's wounds are not life-threatening, and that he is recovering.

Although the investigation is ongoing, Avery said Kiselewsky, who has a valid pistol permit, likely will not be arrested based on accounts from witnesses and Kiselewsky, who told police he acted in self-defense.

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