After 12 seasons, NBC’s Chicago Fire is still burning. However, as is the case with any

long-running show, that means it also saw its fair share of breakups. In the season 12

finale on May 21, original cast member Eamonn Walker, who plays Sheriff Wallace Boden,

will leave his series regular role at Firehouse 51, although he occasionally appears. will probably come back. He wouldn’t be the first to do so: Jesse Spencer, aka Matt Casey, left in season 10 but returned briefly in season 11 and again in mid-season 12 for a funeral. The character’s wedding to Sylvie Brett (Kara Killmer), also served as her final episode. Read on to celebrate the Windy City’s best fictional firefighting family members who have come and gone over the past 12 seasons. 01 Eamonn Walker as Wallace Boden In the promo for the episode, Kelly Severide (Taylor Kinney) tells Boden, “You’ve made 51 a family, Sheriff.”

Joe Cruz (Joe Miñoso) added, “And this firehouse is a home.” 02 Kara Killmer as Sylvie Brett Killmer joined the show in 2014 and took his final bow in the February 2024 episode which saw the beloved paramedic marry Matt Casey (Jesse Spencer) and move to Oregon to be with him that. “The writing has been on the wall for a long time,” Kilmer told PEOPLE at the time. “Sylvie and Matt, their story, that relationship that’s been building for three years, and then Jesse leaves the show [in 2021]. … She and Matt become a family for sure.” is the most natural, inevitable ending for this part of her.” “When I decided to end my time in Chicago, it wasn’t easy,” Rosende wrote on Instagram. “The people I met were truly special, the friendships I made will last a lifetime and the story I’m about to tell is one that makes me proud.”