The NYPD says a Brooklyn man was shot and killed on board a Q train and the suspect is still on the loose.

Police report the victim boarded a Manhattan-bound Q train at 11:30 a.m. Sunday at the Dekalb Avenue subway station in Brooklyn. As the Q train crossed the Manhattan Bridge, a man allegedly shot and killed 48-year-old Daniel Enriquez.

The NYPD says moments before the gunman opened fire, he was pacing back-and-forth in that train car and the shooting was completely unprovoked. When the train reached the Canal Street subway station, police say the suspect fled the scene.

Enriquez was rushed to the hospital but passed away shortly after. Enriquez worked at Goldman Sachs Global Investment Research Division since 2013. The CEO issued a statement saying in part, "We are devastated by this senseless tragedy and our deepest sympathies are with Dan's family at this difficult time.”

Police are reviewing surveillance footage from inside the subway stations. Anyone with information is asked to contact police.