Kara Killmer and Jesse Spencer, Chicago Fire
Credit: Getty Images

Firehouse 51 paramedic Sylvie Brett received good news and bad news during the Season 11 finale — including a surprise proposal that pulled on our heartstrings. Is Sylvie Brett leaving Chicago Fire? There’s a good chance that Season 12 could be her last, especially with the return of Casey and his latest offer to her. Keep reading to learn more.

Chicago Fire is NBC’s first responder-centered drama series that spotlights the professional and personal lives of firefighters, rescue personnel and paramedics of the Chicago Fire Department’s fictional Firehouse 51. Produced by Dick Wolf, the show is currently in its 11th season and was recently renewed for Season 12 in April 2023 (along with the other One Chicago shows, Chicago P.D. and Chicago Med).

Actress Kara Killmer plays Sylvie Brett, the Ambulance 61 paramedic who transferred to Firehouse 51 in Season 3 to replace the late Leslie Shay after her tragic death. She was in a relationship with Captain Matthew Casey (Jesse Spencer), who was a series regular on the firefighter drama until Spencer left the show in Season 10. (Spencer has reprised his role as a guest star on numerous occasions throughout Season 11.)

Brett and Casey’s started seeing each other officially in Season 9, but their relationship went downhill when Casey moved to Oregon to be with Andy Darden (Corey Sorenson)’s two sons. The couple decided to try long distance during that time, but in the end, it was too difficult for Brett to keep up with. Brett broke up with Casey over the phone in Season 11, Episode 1, “Hold On Tight.”

Matt Casey, Sylvie Brett, Chicago Fire

In an interview with NBC Insider in September 2022, Killmer said she was excited to explore her character following her breakup with Casey. “It’ll be interesting to see her really dedicate herself to her career,” she said. “And I think we’ve always seen Sylvie in a relationship. We’ve always seen her in a romance. She’s a hopeless romantic, but I think it’s important to see her come into her own and focus on her own things. Friendships and her career, not just her love life. I’m really excited about being able to explore all of that.” Since then, her character started dating Dylan (Christopher Allen), which became more complicated when Casey returned to Firehouse 51 in Season 11. (And he’s expected to come back for the Season 11 finale, too).

Is Sylvie Brett leaving Chicago Fire and what could happen with Kara Killmer’s character moving forward? Keep reading to learn everything we know.

Is Sylvie Brett leaving Chicago Fire?

Kara Killmer as Sylvie Brett on Chicago Fire

Is Sylvie Brett leaving Chicago Fire? In the Season 11 finale, Casey tells Brett that he’s coming to town to visit. While she wasn’t prepared to see her old flame the last time, she received a heads up this time around. And she’s busy too — she’s trying to adopt a baby from a teen mom. When Casey finally shows up at Firehouse 51, Brett reveals to her former boyfriend that she’s trying to adopt a baby. He asks if Dylan is involved (Brett’s new love interest), she says no but that Dylan’s supportive of her decision. Casey told Brett that he is happy for her — but thankfully, that’s not the last of Brettsey in the Season 11 finale.

Although Brett initially thought that Dylan was supportive of her plans to adopt the baby, she learns that he’s not. He breaks up with her and says that they are at different places in their lives. Later in the episode, Casey goes to Brett’s apartment. He tells her that he got her something a year and a half ago and wants to give it to her before he returns to Portland. In a surprising turn of events, Casey gets down on one knee and proposes to Brett with a gorgeous diamond ring.

“Sylvie Brett, we were meant to be. Will you make me and three kids the luckiest family in the world? Will you marry me?” he asks his former love also referencing Andrew Darden (Corey Sorenson)’s two sons that he takes care of in Oregon. Brett is filled with emotion, but the episode ends without the audience finding out whether she said yes or no. (Check out Casey and Brett’s relationship timeline to learn about their whirlwind romance.)

Variety reported on May 2, 2023, that Jesse Spencer (Brett’s ex-boyfriend and former Chicago Fire lead) will make another guest appearance during the Season 11 finale, which aired on May 24, 2023, as Brett waited for “life-altering” news. We finally learned what the “life-altering” news was in Season 11, Episode 20, when Brett and Violet Mikami had to deliver a baby prematurely. The delivery became more complicated when they learned that the mother didn’t want to keep baby. After the baby was born, the birth mother gave the baby up for adoption using Firehouse 51’s anonymous door. In the following episode, “Change Of Plans,” Brett declared that she wanted to adopt the abandoned baby, but she needed the birth mother’s help. For Brett, she didn’t make this decision lightly; she revealed to Chief Boden that she sees herself in the baby because she was also abandoned as a child.

Spencer has also not ruled out coming back to Chicago Fire on a full-time basis. In an interview with Deadline in April 2022, when asked if Spencer could be coming back full time, he responded: “I cannot… answer that question,” Spencer told our sister site. “The potential to come back would be awesome. I’m always open to that but you know, the ball isn’t really in my court. I always told [series co-creator] Derek Haas that if there were episodes that he thought would be appropriate for me to come back, then I’m totally open to that because I want to see the old gang and I love working there. But in terms of me coming back full-time or something, I have no idea.”

If Brett accepts his proposal, there is a good chance she good leave the show and move to Oregon with her adopted baby and Casey. Her exit would join a slew of cast members who have decided to depart the series, including Jesse Spencer, Monica Raymund, Yuri Sardarov and more. In May 2023, we learned that Taylor Kinney, who plays Kelly Severide, will not be returning to Season 11 after he took a temporary break from Chicago Fire to “deal with a personal matter.” Sources told Deadline that the cast and crew were informed of Kinney’s leave on January 20, 2023, and future scripts will be written to accommodate his absence from the series. His last episode on Chicago Fire was in Season 11, Episode 15. During the first few months of Taylor Kinney’s break, he was not seen at public events and went silent on his social media platforms. The actor walked his first red carpet since his Chicago Fire exit at the 2023 MotoGP VIP Experience & Charity Giving event on April 15, 2023, but the details of his temporary leave are still unknown.

Chicago Fire is available to stream on Peacock.

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For more on Chicago Fire, check out our photo gallery of the most shocking deaths on the show that we’re still not over