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Sources say the officer, identified as Michael Mininni, 25, was getting a haircut at a barbershop located at 1706 Bath Avenue and Bay 16th Street in Bensonhurst when Carmelo Calabro, 77, walked in around 1:30 p.m.

Sources say the two men got into an argument stemming from a long-standing dispute between their two families.

Witnesses tell police a struggle ensued and the officer fired four shots from his Glock nine-millimeter gun, striking Calabro in the face and torso and killing him.

"I was down the block and all I heard was two gun shots, and that's it. Then I ran over here and everything just got cut off and cops showed up and they just covered up everything. That's all I heard. I didn't hear nothing else," said eyewitness Saquib Khalil. "I don't know what happened inside -- maybe some kind of a fight. All I heard was two gunshots and then I just left."

“I heard two gun shots go off in the barbershop,” said another witness. “Before you know it, there are people flying out the barbershop.”

Mininni was taken to Lutheran Hospital for injuries to his arm sustained during the fight.

Police sources say the two men's families had been feuding for years, and that it even resulted in an order of protection.

Neighbors told NY1 that Calabro had a bad temper.

“The guy was a little bit off the wall, you know, the guy that got shot,” said a neighbor. “He pulled a shotgun out on somebody once too before, but nothing happened. He looked wild, but I thought he was harmless.”

“I didn’t even know they had problems,” said another. “I just know he gets very mad when you park in his house, the older guy.”

The union representing correction officers says that Mininni acted in self-defense.

No charges have been filed against Mininni.

The Department of Correction said that Mininni has a good record at the detention center where he works and is authorized to carry a weapon.