Bystander Gregory Delpeche is in critical condition after being shot by the New York Police Department as officers were attempting to catch a suspect who reportedly skipped out on paying subway fare.

The suspect, Derell Mickles, could face charges of attempted assault of a police officer and two counts of fare evasion.

A bystander who was shot by police officers while they pursued a man accused of fare evasion in a Brooklyn subway station is brain dead, sources told PIX11 News. Officers followed Derell Mickles, 37,

Police officials shared more details about the Brownsville, Brooklyn subway station shooting during a Wednesday evening news conference. They said the violence, captured on body-worn cameras and 15 surveillance cameras at the station and on the trains, began when a man accused of fare evasion later charged at police with a knife.

Two officers pursued a fare evasion suspect, then opened fire as he approached them, police said. The suspect, one officer and two bystanders were shot.

One of the officers who opened fire Sunday was struck under his armpit by his partner’s bullet and two innocent straphangers were wounded.

New York police have defended their actions after a bystander was shot in the head as two officers tackled a fare-evader armed with a knife in a busy subway station. The man was in critical condition after the shooting at Sutter Avenue L station in Brooklyn on Sunday afternoon.

There are new details on Sunday's police shooting on a Brooklyn subway platform that injured four people, including an NYPD officer and two civilians. CBS News New York learned on Monday a bystander took a knife that was at the scene that police said the suspect was wielding at the time he was shot by officers.

Police say that a man suspected of not paying the subway fare did not follow instructions and threatened officers with a knife.