Updated

A violent parolee was being sought Monday for allegedly pushing a Bronx dad to his death in front of a subway train — as the motorman apologized to the victim’s family for not being able to stop in time.

The suspect was identified as homeless thug Kevin Darden — who has more than 30 arrests, including for trying to set his brother’s house on fire.

The 35-year-old vagrant, who has done at least one stint in prison, was most recently arrested Nov. 9 in Midtown for pick-pocketing, sources said.

Darden is the prime suspect in the death of Wai Kuen Kwok, 61, who was randomly pushed in front of a D train at the East 167th Street station in Highbridge at about 8:45 a.m. Sunday as his horrified wife looked on, the sources said.

Motorman James Muriel told The Post that he is grieving for Kwok’s widow.

“I would like to apologize to the family,” Muriel said. “There was nothing I could have done.

“I see a body flying across the tracks. I placed the train in emergency. The train doesn’t stop right away,” he went on.

“All of my passengers were crying with me. They were consoling me. They told me it wasn’t my fault.”

Muriel, a 23-year MTA veteran, said he was so shaken that passengers had to help him out of his subway cab so he could look at Kwok to see whether he was still alive, as is procedure.

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