GRAND RAPIDS, MI – After the release of surveillance video, police have identified a man suspected of critically injuring another with a punch to the head.

Police also identified three others in the group, including a man suspected of stealing the unconscious victim’s cellphone.

The victim, whose name has not been released, remains in critical condition at an area hospital after he was knocked out early Sunday, March 17, at Ionia Avenue SW and Cherry Street.

Detectives are investigating. Police will present the case to prosecutors once the investigation is complete.

The four had an encounter with another group before one of them appeared to punch another in the head, knocking him down.

Another is shown on surveillance video going for what appeared to be a cell phone next to the victim.

Lt. Kristen Rogers said that the public’s help was crucial in identifying the suspects.

Sgt. Dan Adams said police have no indication that anyone in the two groups knew each other. He would not speculate on a motive or discuss any statements made by the suspects.

The incident should not deter people from visiting downtown at night, Adam said.

“Downtown has just really been a safe place to hang out. Unfortunately … ," he said. "We really hope it doesn’t keep people from coming to the downtown. This isn’t a common occurrence.”

He said that surveillance cameras provided important evidence, both to identify the suspects and document the crime.

Grand Rapids police have started a program to register camera-security systems at homes and businesses to help police quickly look for video after a crime happens.

Police can view the crime, or track an assailant or vehicle fleeing a scene, without having to go to individual businesses or homes to see if they have surveillance cameras.

To register a camera system, go here.