Police in New York City searched Monday for a gunman who fatally shot a subway rider in an apparently random attack.

The shooting occurred Sunday morning on a Manhattan-bound Q train traveling over the Manhattan Bridge, NYPD Chief Kenneth Corey said.

The suspect pulled out a gun after pacing in the last train car and “without provocation” shot the victim at close range, Corey said at a news conference Sunday.

The suspect fled once the train arrived at the Canal Street station, and police reviewed surveillance video from the station, Corey said. Police and EMS arrived at the station, and the victim was transported to a hospital where he died, Corey said.

Police identified the victim as Daniel Enriquez, 48, of Brooklyn. Enriquez’s sister, Griselda Vile, told The New York Times and Post her brother was heading to brunch when the shooting occurred. Enriquez lived in Park Slope and worked at Goldman Sachs, she said, telling the Times he was “a special, jovial guy.”

MORE ON THE SHOOTING:New York City subway shooting leaves 1 dead, authorities say; suspect remains at large

Goldman chair and CEO David Solomon said in a statement Enriquez was a dedicated and beloved employee who “epitomized our culture of collaboration and excellence.”

No other injuries occurred during the shooting, and witnesses worked with police, Corey said. The suspect was described as a dark-skinned, heavyset male with a beard wearing a dark hooded sweatshirt, gray sweatpants and white sneakers, Corey said.

Police Commissioner Keechant Sewell tweeted a photo of the unidentified man Monday, asking for the public’s help in locating him.