CHICAGO (CBS) — The Chicago Police Department’s chief of detectives resigned Monday, the latest resignation following the release of the Laquan McDonald shooting video.

A police source confirmed Dean Andrews’ resignation Monday.

On Sunday, the head of the Independent Police Review Authority, Scott Ando, resigned.

TIMELINE: The Shootings Of Laquan McDonald, Ronald Johnson

Last week, Mayor Rahm Emanuel asked for the resignation of Police Supt. Garry McCarthy.

McCarthy promoted Andrews to chief of detectives in October. Andrews replaced John Escalante, who had been promoted to first deputy superintendent. Escalate was named acting superintendent after McCarthy was fired last week.

The promotion came despite the fact that, Andrews supervised the failed 2011 investigation of the death of David Koschman, who was punched by Mayor Richard Daley’s nephew R.J. Vanecko.

Andrews was implicated in the creation of an allegedly fictious witness statement that helped prevent police and Cook County prosecutors from charging Vanecko.

At the time, Mayor Emanuel said the fact Andrews is still under investigation by the City Inspector General’s office for his role in the Koschman case did not disqualify him from promotion.

“For the last 18 months, while you were a reporter, he was the head of the Area North. That’s a very big role, and he, like the other promotions across the front, as also the other promotions over the years are based on their professionalism and their capacity; and they’re held accountable for the results ,” the mayor said.

Monday afternoon, Escalante released a statement saying that Andrews is retiring.

“Chief Andrews felt the timing was best so that the department could move forward with the current leadership transition so a new administration would be able to assemble their own team of senior commanders,” the statement said.

