A police officer who shot and killed a 38-year-old Black man in Madison, Wisconsin, last month has been identified by investigators. Kiel Baitinger-Peterson, a white officer with nearly 11 years of law-enforcement experience, fired the shots that killed Corey Ruiz on 22 July, the Wisconsin Department of Justice’s Division of Criminal Investigation said.

The shooting sparked several days of protests and renewed calls from members of Madison’s Black community for action on racial justice and the treatment of people of colour by authorities.

Police said four officers had surrounded Ruiz, who was riding a bicycle, after receiving reports of someone checking parked cars and an alleged attempted burglary.

The state Justice Department said two officers tried unsuccessfully to use a Taser on Ruiz. It said Ruiz then “brandished a knife and injured” Officer Baitinger-Peterson, who subsequently fired his weapon.

Authorities have not disclosed the extent of the officer’s injuries. They have released an image of a fixed-blade knife recovered at the scene.

There is no body-camera footage of the confrontation because Madison police officers do not wear body cameras. Bystanders did, however, record parts of the incident.

Ruiz’s mother, Elsa Ruiz, said after the shooting that her son had been devoted to his family. “He loved his daughter, he loved his family,” she said. “He did not deserve to be taken out like that. They took my baby from me.”

Jim Palmer, executive director of the Wisconsin Professional Police Association, the state’s largest police union, issued a statement on behalf of the officer. “I am deeply concerned for the safety and privacy of him, his family, and the other officers involved,” Palmer said.

He said those concerns were being taken seriously and that “appropriate precautions” were in place. “I urge everyone to allow the investigation to proceed and to refrain from prejudging the officers or placing them and their families at further risk,” he said.

Baitinger-Peterson and the three other officers involved in the confrontation have been placed on paid administrative leave while the state investigation continues.

Dane County District Attorney Ismael Ozanne will review its findings before deciding whether to bring charges against Baitinger-Peterson.

Civil rights attorney Ben Crump, who represents Ruiz’s family, has called for the officer to be charged.