A retired NYPD officer shot and killed an alleged robber inside a Queens bar early Monday morning, firing one fatal shot into the victim's head. A spokesman for the department confirmed that the 69-year-old shooter had served in the NYPD, and retired decades ago.

The former officer, who has yet to be identified, stayed on the scene and was not arrested. He was one of three bar patrons at the time of the incident.

Police responded to a call regarding a male shot at The Parkside Pub on 149th Street near 24th Road in Whitestone just before 4:00 a.m. on Monday morning. Upon arrival, they discovered an unidentified man in his 30s with a gunshot wound to the head. The victim was declared dead at the bar. Police say he had not fired any shots before he was killed.

According to the NYPD, the man entered the bar with a firearm and was "in the process of robbing the establishment" when the former officer shot him. NBC reports that he allegedly managed to take cash from the register.

An investigation into the shooting is ongoing. The NYPD could not immediately confirm which precinct the retired cop served.

UPDATE: The NYPD has identified the deceased, initially believed to be in his 30s, as 24-year-old Andrew McClean of Queens.