Police are looking for a man who pushed a fellow rider into the path of an oncoming subway train following a dispute, killing him.

It happened at the 49th Street and Seventh Avenue station around 12:30 p.m.

The Metropolitan Transportation Authority says the victim was struck by a Q train as it was pulling into the station.

Service has been suspended on the Q, N and R trains, pending a police investigation.

Witnesses tell police the victim had been arguing with another man, just prior to being pushed.

The suspect, who fled the station, is described at being between 20 and 30 years old and 6-feet tall, with a white t-shirt, a black wool hat and short dreads. He was seen holding a black jacket.

Anyone with information on the case should contact the Crime Stoppers hotline at 1-800-577-TIPS, or text CRIMES and then enter TIP577, or visit www.nypdcrimestoppers.com.