Dermot Mulroneys casting in Chicago Fire appears to redeem a role he played five years ago. Chicago Fire has had a famously long run, airing over 250 episodes, and is a part of the One Chicago universe, which features several different shows that all tie together. Over the years, Chicago Fires cast has primarily remained the same, with a few occasional changes. However, the next season will change the show in a big way. Season 13 of Chicago Fire marks the dawn of a new Firehouse 51 Chief, as Dermot Mulroney has been cast as Chief Bodens replacement.

https://screenrant.com/dermot-mulroney-chicago-fire-new-chief-station-19-redemption/