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wgntv | The Chicago Police Department underwent another major shakeup Monday.

Sources have confirmed to WGN that Constantine “Dean” Andrews has resigned his position as the police department’s chief of detectives.

Andrews was appointed to his position by former Chicago Police Supt. Garry McCarthy in October. McCarthy was fired as superintendent last week in the wake of controversy surrounding the police shooting video of Chicago teen Laquan McDonald.

According to the Chicago Sun-Times, which reported Andrews’s departure as a “sudden retirement,” Andrews and other police officers have been under investigation for their roles in a case involving David Koschman, who was fatally punched in the face by Richard J. “R.J.” Vanecko, a nephew of former Mayor Richard M. Daley. Allegations surfaced about falsifying police reports and false claims that Vanecko had acted in self-defense.

Andrews closed the homicide of investigation of Koschman four years ago, according to the Sun-Times, but the paper’s investigation led to the appointment of special prosecutor Dan K. Webb. Webb’s 17-month investigation led to Vanecko’s indictment in December 2012, and Vanecko pleaded guilty in January 2014.

Andrews, who resigned Monday, was named 114 times in Webb’s report.