A 20-year-old man who was shot dead in a gang-related killing caught on video by fellow passengers at a New York subway station has been identified.

The victim, Abel Mosso, and two other men became involved in a dispute on a Manhattan-bound 7 train Sunday afternoon when the deadly fight spilled out onto the platform in Queens.

Police said the fight appeared to be gang-related with 26-year-old gunman Ramiro Gutierrez being a member of MS-13 and the victim part of rival Queens gang 18th Street. Gutierrez was taken into custody Monday.

NYPD Chief of Detectives Dermot Shea said Gutierrez was known by police and had been arrested 12 times previously in New York.

Victim Abel Mosso (pictured) and two other men became involved in a dispute on a Manhattan-bound 7 train Sunday afternoon when a deadly fight spilled out onto the platform in Queens

Graphic footage shows the three men fighting on the platform at the 90th Street-Elmhurst Avenue subway stop in Queens after the train doors opened. The three people standing up behind tried to intervene

Graphic footage shows the three men fighting on the platform at the 90th Street-Elmhurst Avenue subway stop after the train doors opened at about 1pm Sunday.

The victim was punched multiple times before one of the men, dressed in a gray jacket, stood up and pulled out a gun.

He shot Mosso in the head and the footage shows him dropping to the ground.

An additional five gunshots were fired before the two men fled the scene.

Terrified commuters, who had tried to intervene to break the fight up, were filmed screaming as they ran away from the gunfire.

Police said the train and platform were crowded when the gunfire rang out.

The victim died at the scene after suffering multiple gunshot wounds, including one to the head.

The victim was punched multiple times before one of the men, dressed in a gray jacket, stood up and pulled out a gun (pictured right)

He shot the victim - believed to be between 20-30 years old - in the head and the footage shows him dropping to the ground. An additional five gunshots were fired before the two men fled the scene. Terrified commuters were filmed screaming as they ran away from the gunfire

Gutierrez was captured on surveillance cameras fleeing the subway station.

Investigators are still looking for the second attacker and have publicly released a surveillance image of him in a bid to track him down.

Police are still trying to determine if the men knew each other prior to the fight or what sparked the incident.

'This incident is beyond horrifying,' MTA spokesman Max Young said.

'While our system and the city are safer than ever before, we have zero tolerance for any violence on our subways and buses, and the safety of our customers and employees will always be our number one priority.'