Leslie Frazier has been hired as the New Bills DC (Don Juan Moore Getty Images)

Leslie Frazier is most notably known as a defensive back for the greatest defense ever, the 1985 Chicago Bears. Now Leslie Frazier has been hired to become the Bills defensive coordinator. The Ravens will lose their secondary coach in the process of this move. ESPN Ravens affiliate reporter Jamison Hensley first reported the news.

Frazier will serve under rookie head coach Sean McDermott forming an interesting pairing. The duo will try to improve a defense previously ran by Rex Ryan in 2016. Both McDermott and Frazier worked together under Andy Reid in Philadelphia from 1992-2002.

Frazier, 57, has defensive coordinating experience with Bengals, Vikings, and Buccaneers. He also was the head coach of the Vikings from 2011-2013. His hiring seems like a logical choice given his coaching track record.

Buffalo will now switch from a 3-4 defense to a 4-3 look in 2017.