Fired Chicago Police Supt. Garry McCarthy's "right hand man" Robert "BOB" Tracy (former NYPD cop) leaves Chicago Police Department

PHOTO: The Chicago Police Department's chief crime strategist, Bob Tracy, speaks while Police Supt. Garry McCarthy appears before the Budget Hearings at the City Council Chambers in October. | Brian Jackson/ For the Sun-Times

Former Chicago Police Supt. Garry McCarthy’s most trusted adviser has retired to work in the private sector, continuing the massive shakeup of the department that began when the city released the Laquan McDonald video.

Robert Tracy was the chief crime strategist for the police department, creating and running CompStat, a program that uses crime statistics and gang intelligence to hold commanders responsible for crime in their districts.

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