A 57-year-old retired NYPD officer was fatally shot while trying to help a friend break up a fight at a pizzeria in Kensington, police say.

Police responded to a call around 7:30 p.m. on East 3rd Street and Church Avenue and found the retired NYPD officer, Thomas Marrinan, shot in the torso and a 33-year-old shot in the left arm.

Detective Joseph Gulotta says that the initial investigation reveals that the 33-year-old man was involved in a dispute with an 86-year-old man at the Korner Pizza.

“At one point the 57-year-old man and another man, who is 53, came to the aid of the 86-year-old,” Gulotta says. “The two men, who are in their 50s, confronted the 33-year-old man and a physical fight ensued.”

News 12 is told that the friend he was with is a correction officer.

Police believe there was single round fired by the correction officer that struck both Marrinan and the 33-year-old.

The victim spent over 20 years with NYPD Transit.

Dozens of NYPD officers stood side by side to remember their former colleague.

The owners of Korner Pizza put down flowers and lit candles in honor of Officer Marrinan.

They posted a sign saying they are closed for the day, but the owner tells News 12 they are still processing everything that happened

The 33-year-old is in custody in connection to the incident.

Charges are pending.