Police who are looking for a man who shoved a stranger off a New York subway platform to his death, have released surveillance footage of the suspect walking calmly away from the station just minutes after the fatal push.
Wai Kuen Kwok, 61, was standing with his wife on the platform when he was pushed from behind.
Kwok was struck by a southbound D train and pronounced dead at the scene. His wife was not injured.
There was no indication that Kwok knew the man or had had any interaction with him before he was pushed, police said on Monday.
Surveillance footage shows the suspect walking calmly from the subway station. Later footage shows him getting off a bus, heading into a convenience store and then emerging smoking a cigarette.
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The man is balding and was dressed in a leather jacket, dark pants and white sneakers. Police are trying to determine his whereabouts.
The victim's wife, 59, was taken to a hospital for observation. Relatives told authorities Kwok worked for a kitchen supply company, and the couple was planning to have breakfast and do grocery shopping in Chinatown on Sunday.
The victim's son, Gary Kwok, a 29-year-old doctoral student at Adelphi University, told The New York Times that his father was a "fine, regular family man".
About five million people ride the subway every day in New York City. Every year, about 140 people are hit by city subways, many of them in accidental knocks. Fifty people have been killed by subway trains so far this year, and 55 died last year, according to the MTA.
