A man breaching an order of protection was killed inside a hallway late Saturday by an armed 52-year-old woman who turned a gun on him in the South Side Englewood neighborhood.

At 11:44 p.m., the 52-year-old was notified that the security alarm at her home in the 1400 block of West 71st Street went off, according to Chicago police. She opened her front door on the second floor to investigate and encountered a 22-year-old man who had an active order of protection forbidding him to go near that address.

After an argument, she shot him in the left shoulder, police said. He was pronounced dead at University of Chicago Medical Center at 12:10 a.m. Sunday.

The Cook County medical examiner’s office identified him as Daniel L. Erskin, who lived in the same neighborhood.

Erskin was taken into custody April 13 under allegations of domestic battery, criminal sexual abuse of an underage victim, assault, home invasion, burglary, theft and criminal damages to property, Chicago police arrest records show. Two months earlier, he was also arrested on domestic battery charges.

It was not clear whether the 52-year-old or someone she lived with had filed the protection order against Erskin, police said. She was no longer at the scene when officers arrived at the hallway to find him wounded.

Police said no one was in custody as of now because the incident was considered “domestic-related.” The shooting remained under investigation Sunday morning.