The Chicago Fire season 1 cast was never going to look like the Chicago Fire season 13 cast, but saying goodbye to characters like Boden is still heartbreaking as the show continued on without him. Since Boden is leading the entire Chicago Fire Department following his surprising Chicago Fire season 12 exit, someone has to replace him as Firehouse 51's chief. Actor/Actress Character Episode Featuring Their Exit Alberto Rosende Blake Gallo Chicago Fire season 12, episode 1, "Barely Gone" Kara Killmer Sylvie Brett Chicago Fire season 12, episode 6, "Port in the Storm" Rome Flynn Derrick Gibson Chicago Fire season 12, episode 8, "All the Dark" Eamonn Walker Chief Wallace Boden Chicago Fire season 12, episode 13, "Never Say Goodbye"