Consisting of three incredibly popular shows, Chicago Fire, Chicago Med, and Chicago P.D., the One Chicago universe is one of the most popular television franchises of this time. With Chicago Fire heading into Season 14, it is clear that the show and the franchise as a whole have been around for quite some time. This means several original stars have departed, and some have endured. Jesse Spencer's Matthew 'Matt' Casey exited the NBC show after an announcement in October 2021. It was a game-changing move and a significant shift for the procedural drama, especially with Spencer being an original cast member who appeared in the very first episode of the show. His departure was one that the procedural had to deal with and adjust to over a considerable time.