For nearly a decade, Kara Killmer has been the heartbeat of Chicago Fire as paramedic Sylvie Brett. From her emotional arrival at Firehouse 51 to her deeply beloved romance with Matthew Casey (Jesse Spencer), Brett’s journey has been a rollercoaster of courage, compassion, and unforgettable moments.

But when the latest episode aired, it marked the end of an era: Killmer’s final bow as Brett. Fans witnessed a heartwarming conclusion that gave the character—and her devoted audience—the closure they craved. Brett didn’t just walk away; she walked toward happiness, love, and purpose.

Now, Kara is ready to turn the page on a brand-new chapter in her life and career. In an exclusive conversation, she hints at what’s next, shares her thoughts on leaving Firehouse 51 behind, and reflects on what a decade as a first responder taught her.

A Farewell Worthy of Brettsey

The writers didn’t skimp on the emotional payoff. Brett’s wedding to Matthew Casey was the culmination of years of longing, distance, and rekindled love. Fans finally got the happy ending they’d fought for—and more.

“Brett’s story was wrapped up in such a beautiful way,” Kara tells People. “She gets the husband, the baby, and the opportunity to keep helping people. That’s everything she ever wanted.”

It wasn’t just Brett’s journey coming full circle; Casey, too, found joy and a sense of family in Portland. Together, they’ve built a life that honors the sacrifices they made in Chicago, proving that happy endings do exist—even in the high-stakes world of Chicago Fire.

Jesse Spencer’s Goodbye to Kara

Kara’s co-star Jesse Spencer, who left the series in Season 10, returned for Brettsey’s wedding—and to give his longtime friend a proper sendoff. “I loved working with Kara,” Jesse wrote in a heartfelt goodbye message. “She brought so much heart to the show. It’s been an honor to share this story with her.”

For fans, their reunion wasn’t just a wedding scene; it was a gift, a love letter to the viewers who’ve rooted for Brett and Casey since day one.

What’s Next for Kara Killmer?

So what does life after Chicago Fire look like for Kara? If you think she’s slowing down, think again.

“Next I’m just going to run headlong into auditioning,” Kara reveals. “I know there’s a lot of interesting projects out there. I’m excited to try something new.”

After nearly a decade of playing a first responder, she’s eager to explore fresh roles—and genres. “It’s been humbling and so satisfying to get to play a paramedic for 10 years, but I’m ready to stretch my wings,” she says.

Kara admits that working on one show for so long meant turning down other opportunities. Now, with her schedule wide open, she’s ready to take risks and embrace change. “It’s time to see what else is out there, but I’ll definitely be taking a little bit of the magic from Chicago Fire and Wolf Films with me to whatever set I step onto next.”

Why Her Exit Matters for Chicago Fire

While Kara says goodbye, the One Chicago universe moves forward. Season 12 still has seven more episodes to go, and fans can expect major shake-ups in the paramedic ranks. Violet Mikami (Hanako Greensmith) will step into the role of Paramedic in Charge, and a new partner will join the ambulance team—a dynamic that promises fresh drama.

For longtime viewers, Brett’s departure is bittersweet. She’s not just leaving Firehouse 51; she’s leaving a legacy of kindness, resilience, and unwavering strength. And though the door remains open for future guest appearances, her next chapter is calling.

The Bottom Line

Kara Killmer’s exit reminds us why Chicago Fire works so well: it’s about family, found and forged. Her goodbye isn’t just an ending; it’s a new beginning—both for Sylvie Brett and the actress who brought her to life.

As Kara looks ahead to bold new projects, one thing is certain: wherever she goes next, her One Chicago family—and millions of fans—will be cheering her on.

 Chicago Fire airs Wednesdays at 9/8c on NBC. Season 12 continues with new episodes this spring.