Viewers were forced to say goodbye to many characters in Chicago Fire season 12, including Chief Wallace Boden, who Eamonn Walker has played since season 1. The NBC procedural drama, created by Michael Brandt and Derek Haas, has been a success for the network since its premiere in October 2012. It revolves around the personal and work lives of the firefighters and paramedics of Firehouse 51, including Boden. Over the course of its 13-season run, Chicago Fire has lost many actors who portrayed some of the show's most beloved characters, and after season 12, Walker was added to that list.

From Lauren German as Leslie Shay in season 3 to Yuri Sardarov as Brian "Otis" Zvonecek in season 8, numerous Chicago Fire actors have exited their roles, whether their character died, moved out of Chicago, or a different factor that resulted in them leaving Firehouse 51. Unfortunately, main cast members departing their shows isn't uncommon in series that...