A 36-year-old man was fatally stabbed on a Brooklyn subway train Tuesday night, according to police.

The victim was knifed in the chest on a northbound J train around 8 p.m. before getting off at the Marcy Avenue station, authorities said.

He was taken to Methodist Hospital where he was pronounced dead, cops said.

Police are preliminarily seeking a man and woman in connection to the stabbing who remained on the subway after the attack.

It was not immediately clear what led to the stabbing.

The identity of the victim was not yet revealed pending family notification.