Matthew Diebel

USA TODAY

New York City police are hunting a man who pushed a Chinese immigrant to his death in front of a subway train in the Bronx.

Wai Kuen Kwok, 61, was about to board a train early Sunday morning with his wife for a trip to Manhattan's Chinatown when an apparent stranger shoved him into the path of a D train, according to local media.

The driver slammed on his brakes, but it was too late, according to a report in the New York Post, which said that the lead subway car struck Kwok while his body was still in midair.

Later, city police released a surveillance video of a suspect — a middle-aged, balding man dressed in a black leather jacket, black pants and white sneakers — boarding a bus and then getting off and smoking a cigarette.

On Monday morning, an NYPD spokeswoman told USA TODAY that they were still hunting for the suspect. "There's nothing new, unfortunately," she said. "We're still looking."

Kwok and his wife, Yow Ho Lee, 59, were on their way to do their weekly grocery shopping, the couple's son told the Post. According to the New York Daily News, Lee told investigators that there was no interaction between her husband and the man before the incident. She was taken to Bronx-Lebanon Hospital to be treated for emotional trauma.

"Push, push!" Lee screamed, according to witnesses quoted by the New York Times, uttering one of the few English words she knew.

"Please tell the world he is a fine, family man," Kwok's son Gary, 29, a doctoral student at Adelphi University, told the Times.

Detectives quoted by the Times said they believe the suspect may live in the vicinity of the 167th Street station, where the attack took place.