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Chicago Mayor Rahm Emanuel, left, and Police Superintendent Garry McCarthy appear at a news conference, Tuesday, Nov. 24, 2015, in Chicago, announcing first-degree murder charges against police officer Jason Van Dyke in the Oct. 24, death of 17-year-old Laquan McDonald. The city then released the dash-cam video of the shooting to media outlets after the news conference. (AP Photo/Charles Rex Arbogast)
Chicago Mayor Rahm Emanuel, left, and Police Superintendent Garry McCarthy appear at a news conference, Tuesday, Nov. 24, 2015, in Chicago, announcing first-degree murder charges against police officer Jason Van Dyke in the Oct. 24, death of 17-year-old Laquan McDonald. The city then released the dash-cam video of the shooting to media outlets after the news conference. (AP Photo/Charles Rex Arbogast)

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    DOJ investigating Chicago Police Department

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DOJ investigating Chicago Police Department

The Justice Department is investigating the Chicago Police Department following a string of officer-related shootings. CNN's Ryan Young has the latest.

DOJ investigating Chicago Police Department

The Justice Department is investigating the Chicago Police Department following a string of officer-related shootings. CNN's Ryan Young has the latest.