Khalil Yamen, 23, is accused of shooting and killing Tracey Morgan in 2015.
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That victim was the brother of Corey Morgan who is one of three people charged in the murder of Tyshawn Lee.
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The 9-year-old was gunned down last November. Police say Lee was targeted, lured from a playground into an alley where he was shot repeatedly and killed November 2015. The fourth grader's basketball was found nearby. Then-Superintendent Garry McCarthy said police believed the murder was part of a series of gang-related shootings.