On Tuesday, police picked up Kevin Darden, a man accused of shoving a stranger in front of a New York subway train on Sunday, near his mother's home in the Bronx.

Darden, 34, is also a suspect in a separate incident in which a man earlier this month was pushed to the ground at another subway station and suffered minor injuries, The New York Times reports.

According to the police, Darden, who his mother has described as homeless, has a history of arrests for assault and robbery, including a pickpocketing bust on Nov. 9 which was one week before authorities say he pushed Wai Kuen Kwok, a 61-year-old Chinese immigrant, off a subway platform in front of a train.

Kwok was standing with his wife on a platform at the Grand Concourse and East 167th Street station in the Bronx on Sunday when he was pushed from behind by a man and subsequently struck by an approaching southbound D train. Kwok died at the scene. His wife wasn't injured.

“You shouldn’t walk in front of me,” the assailant said before shoving Kwok to the ground according to police. “I’m warning you.”

There was no indication that Kwok knew the man or had had any interaction with him before he was pushed, police said.

Kwok's wife said she did not recognize the man.

Surveillance footage shows the assailant walking calmly from the subway station. Later footage shows him getting off a bus 10 blocks away, heading into a convenience store and then emerging smoking a cigarette.

During the three-day manhunt for Darden, the victim of an earlier shoving episode, a 51-year-old man pushed to the platform of the West Fourth Street subway station on Nov. 6, told the police that he had been attacked by the same man who appeared in the video from Sunday.

About 5 million people ride the subway every day in New York City. Every year, according to The Associated Press, about 140 people are hit by city subway trains. This year alone, 50 people have been killed by subway trains, while last year the number was 55.