https://screenrant.com/chicago-fire-season-12-severide-casey-carver-gibson-replacement/

Just before Jesse Spencer's true exit. Chicago Fire season 12 secretly set up Kelly Severide and Matt Casey's perfect replacement at Firehouse 51.

Chicago Fire's Casey & Brett Replacement Can Be So Much Better Thanks To 1 Big Difference (https://screenrant.com/chicago-fire-casey-brett-replacement-carver-violet-better/)

Chicago Fire lost one of its best romantic pairings when Brett and Casey got married. Luckily, its replacement has the potential to be better.