MOUNT EDEN, The Bronx (CNN) -- Police in New York City are looking for the person they say pushed a man to his death from the subway platform into the path of the D train on Sunday, all while the victim's wife looked on in horror, helpless.
Police have little to go on, said Lt. John Grimpel. The description of the attacker is simple: a male wearing a dark jacket.
The horrific crime is "believed to be random," Grimpel said.
The victim was identified as Wai Kuen Kwok, 61, of the Bronx, police said. He was killed by an incoming subway train.
Kwok's wife was with him and was taken to the hospital for trauma, police said, though she was not physically injured.
Kwok was standing on the platform at the subway station at 167th Street and Grand Concourse when he was apparently pushed. First responders arrived at about 8:45 a.m., and Kwok was pronounced dead at the scene.
The attacker then fled the station and has not been identified or found, police said.
The incident is being investigated as a homicide, but a motive was lacking at the outset.
Police would not speculate whether there was an altercation between Kwok and the culprit, or whether there are any indications of a hate crime.
Sunday evening, police released surveillance video of a person wanted for questioning in connection with the homicide but did not call the person a suspect.