A retired Westchester County police officer murdered four men — including two who were just in the wrong place at the wrong time — in a “gangland-style” crime during a drug deal gone bad, prosecutors said Tuesday.

Nicholas Tartaglione, who worked as a cop in Briarcliff Manor and Mount Vernon, as well as upstate Pawling, was arrested Monday for killing Martin Luna, Urbano Santiago, Miguel Luna, and Hector Gutierrez in April at a bar called Likquid Lounge in Chester, Orange County, authorities said.

“While all murders tear at the fabric of our communities, when the alleged perpetrator of a gangland-style, quadruple homicide is a former police officer, that strikes at the heart of civilized society,” Manhattan US Attorney Preet Bharara said.

“These four men had not been seen or heard from since the day of their alleged murder,” Bharara added of the victims, whose bodies were never found. “We hope that today’s arrest brings some measure of comfort to the victims’ families and loved ones.”

The murders were part of a conspiracy to distribute cocaine that Tartaglione, 49, and others were part of since June 2015 until April of this year, officials said.

Tartaglione of Otisville could face life in prison or the death penalty if convicted.

He pleaded not guilty at his arraignment in White Plains federal court.

Tartaglione’s lawyer didn’t immediately return messages.