MADISON, Wis.>> Protesters burst into a Thursday news conference about the police shooting of a homeless man in Madison, taking the microphone from the police chief and arguing with some attendees who said they wanted to hear more about the investigation.

The group of about 20 protesters burst into the room at the Madison police station, shortly after Mayor Satya Rhodes-Conway and Common Council President Sabrina Madison identified the man killed by police as Corey Ruiz, a homeless resident.

Ruiz was shot and killed Wednesday after police said he resisted arrest and wounded an officer with a knife.

Police Chief John Patterson stepped away from the microphone when the protesters were shouting, and one man in the group took his spot at the podium. The event quickly devolved into a shouting match.

Moments earlier, the mayor said the shooting will be “rigorously investigated.”

“It does not matter who you are or what your past is, you should not lose your life as a result of an encounter with law enforcement,” Satya Rhodes-Conway said.

Madison said, “Corey could have been my brother because my brother is homeless and he often rides a bike.”

“He’s a human being. He had a family. He has parents who loved him who brought him home, who cared for him,” she said, adding that she’s struggling to understand what she’s seen in videos of the shooting that have circulated on social media.

“My first thought is, when the officer’s walking away, why isn’t he walking away in cuffs,” Madison said.

Once the protesters quieted down, the chief resumed his presentation, promising his department’s full cooperation with the state investigation.

The shooting has roiled Wisconsin’s capital city, with Gov. Tony Evers calling for “transparency and accountability” and Madison community members gathering Thursday at a growing memorial.

None of the four officers who were detaining the man wore body cameras, but passersby recorded the confrontation on video and accused the officers of overreacting.

“I thought, ‘Holy cow — what could have warranted that?’ It looked to me like they had him under control,” David Ortiz-Whittingham, who saw officers swarming and heard the gunshots, said Thursday. “Even now, knowing about the knife, did he have to die for it? Could this have been de-escalated without him losing his life?”

The police chief released few details Thursday, saying the Wisconsin Department of Criminal Investigation into the officer-involved shooting must run its course.

Earlier Thursday, Madison’s independent police monitor, Aeiramique Glass, said police have not yet shared evidence or the officer’s identity with her office, which will review the case and can recommend to the district attorney that charges be filed if warranted. She said the department and city are “obstructing what the community and the public” want.

Patterson has urged caution in reading too much from the cellphone videos. They don’t show the perspective of the officers, he said, and additional video that hasn’t been released is being reviewed.

The officer who fired his weapon is a veteran of the force, the chief said. He and the three other responding officers will be placed on administrative leave pending an independent investigation by the Wisconsin Department of Criminal Investigation, as required under state law.

Patterson said police were responding to calls that someone was attempting to enter parked vehicles, and the suspect fled on a bike before the officers surrounded him. One deployed a Taser but failed to control the man, Patterson said.

In the videos circulating online, the man can be seen standing before he’s brought to his knees as the officers struggle to force him into a prone position. Then he falls quickly to the pavement after what sounds like three gunshots, and seems motionless as the officers handcuff him behind his back. Arriving officers then escort one of the officers a short distance away.