BROOKLYN, N.Y. (WPIX) –  The man who police say shot a subway rider in the head during an argument on a Brooklyn train Thursday afternoon won’t be charged, prosecutors said.

Younece Obuad, 32, allegedly shot Dajuan Robinson, 36, after the victim picked a fight with him on a northbound A train as it pulled into the Hoyt-Schermerhorn Streets subway station around 4:45 p.m., according to the NYPD and sources.

Police say Robinson was also stabbed by a woman during the rush-hour chaos.

The woman, who was with Obuad when he allegedly shot the Robinson, was captured on video cutting the victim with a sharp object, NYPD Chief of Transit Michael Kemper said Friday.

It was unclear when during the incident the woman attacked Robinson , according to police.

“It’s a very active case,” Kemper said.

Authorities said Thursday that the victim is believed to have started the argument after the Obuad boarded the A train at the Nostrand Avenue station.

“This 36-year-old male was described by multiple witnesses as being aggressive and provocative toward the 32-year-old who just got on,” said Kemper.

Police said Robinson pulled a gun on Obuad, who disarmed him and shot him in the head.

The victim was still in critical condition as of Friday morning, police said. Cops quickly apprehended the alleged shooter at the scene; Obuad was still in police custody Friday.

There may have been more than two dozen people on the train when the shooting occurred, according to Kemper. No other injuries were reported.

At Friday’s press conference, MTA Chief Janno Lieber thanked the NYPD for apprehending the alleged shooter and assisting at the scene.

“I’m here today to thank police officers who intervened and responded yesterday,” Lieber said Friday morning. “The cops went the extra step. As people were rushing up the stairs and rushing down the stairs, they made an immediate apprehension.”

The shooting happened just as the evening rush hour got underway. A and C trains were running with delays in both directions following the NYPD investigation at the Hoyt-Schermerhorn Streets station, according to the MTA. Service has since been restored.

Subway safety has been a key focus of Gov. Kathy Hochul and city authorities after a string of high-profile crimes, including back-to-back shootings on Bronx subways.