Warning! Spoilers ahead for the Chicago Fire season 12 premiere. Chicago Fire season 12 fails Brett by having her give up everything in Chicago to move to Portland with Casey after their engagement.

Jesse Spencer's departure in Season 10 truly was the end ... even though it is removed from the days of Casey. Eigenberg also said of the Chicago Fire cast: We've had tough days when life occurs ...

Matt Casey (Jesse Spencer) was responsible for the most memorable moment of Chicago Fire season 11. Despite no longer being part of the main cast, the character decided to show up and shock ...