NEW YORK (AP) — Police have released surveillance footage of a man suspected of shoving a stranger off a subway platform to his death.

The 61-year-old victim was standing with his wife Sunday afternoon at a station in the Bronx. Authorities say that without warning, a man pushed him onto the tracks as a "D'' train was entering the station. His wife told police the act was unprovoked.

Authorities say the suspect fled the station, hopped onto a bus and took it a few stops.

Surveillance footage shows the man 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.

The suspect is balding and was dressed in a leather jacket, dark pants and white sneakers.