(CBS) — Chicago Police talked to a person of interest in the murder of nine-year-old Tyshawn Lee, CBS 2’s Mai Martinez reports.

The person of interest walked into a Chicago Police station with an attorney to be questioned by detectives Wednesday afternoon. That person was later released.

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Lee was fatally wounded in an alley near 80th and Damen Monday afternoon. He had been shot multiple times in the upper body. Sources tell CBS 2 that Lee may have been lured into the alley.

Police spokesman Anthony Guglielmi says the male person of interest most likely knew police were looking for him.

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Complicating the investigation is the fact that Tyshawn Lee’s father, who according to police is a documented gang member, is not cooperating.

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There is a $35,000 reward for information leading to the boy’s killer.