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CHICAGO -- Chicago police have identified the killer of a 9-year-old boy.

22-year-old Dwright Boone-Doty has been charged with first-degree murder in the death of Tyshawn Lee.

Cook County State's Attorney's Office announced the felony charges Monday night.

Boone-Doty has been charged with five felony offenses in connection with three separate cases, including the murder of Lee.

Sources say Boone-Doty targeted, lured and executed the boy in an alley last November.

Boone-Doty is also charged with first degree murder in connection with the murder and attempted murder of Brianna Jenkins and Deshari Bowens which occurred in October of last year.

Police announced details of the charges during a press conference on Tuesday. Authorities say Lee was targeted because of his father's alleged gang ties.

“These are calculated killers whose actions define the words brutality and cowardice,” said Chicago Police Interim Supt. John Escalante.

According to Cook County State's Attorney Anita Alvarez, Doty wanted to "torture" Lee and cut off his fingers and his ears. Alvarez added that Doty had also set up surveillance on Lee's grandmother.

Assistant State's Attorney George Canellia said Doty laughed as he described to another inmate how he shot Lee in the head.

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Two people are already in custody for Lee's murder.

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