Chicago Police Department

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FILE - In this Oct. 20, 2014 frame from dash-cam video provided by the Chicago Police Department, Laquan McDonald, right, walks down the street moments before being fatally shot by CPD officer Jason Van Dyke sixteen times in Chicago. The Department of Justice is poised to release its report detailing the extent of civil rights violations committed by the Chicago Police Department. The next stage after the Friday, Jan. 13, 2017, release will be negotiations between the DOJ and the city. (Chicago Police Department via AP File)

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Chicago Police Commander Kevin Duffin speaks during a news conference, Thursday, Jan. 5, 2017, on the hate crime and other charges filed against four individuals for an attack on a man that was captured on a Facebook video. Chicago Police Superintendent Eddie Johnson listens at left. (Antonio Perez/Chicago Tribune via AP)

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These booking photos provided by the Chicago Police Department show, from left, Tesfaye Cooper, Brittany Covington, Tanishia Covington and Jordan Hill, four people charged, Thursday, Jan. 5, 2017, with aggravated kidnapping and taking part in a hate crime after allegedly beating and taunting a man in a video broadcast live on Facebook. (Chicago Police Department via AP)

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This booking photo provided by the Chicago Police Department shows Jordan Hill, of Carpentersville, Ill. Hill is one of four people charged Thursday, Jan. 5, 2017, with aggravated kidnapping and taking part in a hate crime after allegedly beating and taunting a man in a video broadcast live on Facebook. (Chicago Police Department via AP)

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This booking photo provided by the Chicago Police Department shows Brittany Covington of Chicago. Covington is one of four people charged Thursday, Jan. 5, 2017, with aggravated kidnapping and taking part in a hate crime after allegedly beating and taunting a man in a video broadcast live on Facebook. (Chicago Police Department via AP)

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This booking photo provided by the Chicago Police Department shows Tanishia Covington, of Chicago. Covington is one of four people charged Thursday, Jan. 5, 2017, with aggravated kidnapping and taking part in a hate crime after allegedly beating and taunting a man in a video broadcast live on Facebook. (Chicago Police Department via AP)

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This booking photo provided by the Chicago Police Department shows Tesfaye Cooper of Chicago. Cooper is one of four people charged Thursday, Jan. 5, 2017, with aggravated kidnapping and taking part in a hate crime after allegedly beating and taunting a man in a video broadcast live on Facebook. (Chicago Police Department via AP)

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This undated photo provided by in the Chicago Police Department shows Paul Pagan. Chicago police said Monday, Sept. 26, 2016 they've charged Pagan, an alleged gang member, with murder in the slaying of a man who was shot last weekend near Millennium Park, a popular downtown tourist attraction. (Chicago Police Department via AP)

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In this March 30, 2012 photo, Chicago Police Department's Eddie Johnson is seen in Chicago. Chicago Mayor Rahm Emanuel's office said in a statement late Sunday, March 27, 2016, that Emanuel is set to introduce Johnson, the force's current chief of patrol, as the department's new interim superintendent on Monday. (Rich Hein/Chicago Sun-Times via AP)

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A Chicago police sergeant speaks with a relative of a 19-year-old man killed in a police-involved shooting in the West Garfield Park neighborhood in Chicago on Saturday, Dec. 26, 2015. A Chicago police officer shot and killed the 19-year-old man and a 55-year-old woman early Saturday while responding to a domestic disturbance call on the city's West Side, police said. (Megan Crepeau/Chicago Tribune via AP)

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In this Oct. 20, 2014, frame from dash-cam video provided by the Chicago Police Department, Laquan McDonald, right, walks down the street moments before being shot by Officer Jason Van Dyke in Chicago. Van Dyke, who shot McDonald 16 times, was charged with first-degree murder Tuesday, Nov. 24, 2015. (Chicago Police Department via AP)

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In this Oct. 20, 2014 frame from dash-cam video provided by the Chicago Police Department, Laquan McDonald, right, walks down the street moments before being shot by officer Jason Van Dyke in Chicago. Van Dyke, who shot McDonald 16 times, was charged with first-degree murder Tuesday, Nov. 24, 2015. (Chicago Police Department via AP)

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A photograph taken more than a decade ago that shows two smiling Chicago police officers posing over a black drug suspect has been rebuked by police superintendent Garry McCarthy after the Chicago Sun-Times published it on Tuesday. (Cook County court file via Chicago Sun-Times)