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CHICAGO — Chicago police fatally shot the brother of a murder suspect they were searching for in connection to the death of a 15-year-old boy.

Police spokesperson Anthony Guglielmi said the Chicago Police Department’s fugitive team was attempting to take a murder suspect from a May 14 homicide into custody on the 8100 block of South Chappel Avenue around 1:45 p.m. Tuesday.

During the arrest, a 21-year-old man, who was sitting in a car, displayed a gun and was then shot by police, according to officials. He was taken to the University of Chicago Medical Center where he later died.

Police originally reported that the man fired at officers during their investigation. They later said he displayed a handgun.

Officials said that after a formal identification, it appeared the man who was shot, who was identified by family as 21-year-old Curtis Stagger, was the brother of the person they were searching for. He was not the person they were trying to take into custody.

Authorities said the officers were searching for a suspect in the fatal shooting of Jaylin Ellzey, 15. Ellzey and a 23-year-old woman were shot in a drive-by attack. Police said that on Sunday they arrested a 29-year-old man in connection with Ellzey’s death, according to the Associated Press.

Curtis Stagger, 21

Stagger’s mother, Charnita Anderson, said she got a call from a family member while she was at work saying her son had been shot by police.

“He was on his way to come get me from work,” Anderson said. “I don’t even know what went down.  I don’t even know what happened.”

The officer involved in Tuesday’s shooting will be place on routine 30-day paid administrative duty while the investigation continues.

The Civilian Office of Police Accountability is investigating.