The One Chicago franchise, created by Dick Wolf, has captivated audiences for over a decade with its intense, interconnected stories of first responders and medical professionals in Chicago Fire, Chicago P.D., and Chicago Med. These shows have built massive fanbases thanks to their high-stakes drama, emotional character arcs, and crossover events. However, one recurring theme has kept viewers talking: the frequent departures of major cast members.
From heartfelt goodbyes to unexpected exits, actors have left the franchise for personal reasons, new opportunities, creative differences, or production decisions. These changes often refresh the series, introducing fresh dynamics while honoring long-running characters’ legacies. But what are the real reasons behind these exits? In this in-depth article, we explore the most notable departures across the One Chicago universe, drawing from interviews, official statements, and reliable reports up to early 2026.
Why So Many Actors Leave the One Chicago Franchise?
Long-running procedurals like these demand intense filming schedules, often spanning 22+ episodes per season. Actors commit years of their lives, leading to natural burnout after a decade or more. Showrunners have noted that longevity itself drives change—new characters keep stories dynamic and prevent stagnation. Budget considerations, contract negotiations, and evolving creative visions also play roles. As one Chicago Fire showrunner explained in interviews, after 12+ years, “things need to change, just dynamic-wise.”
Now, let’s dive into the real reasons some of the most beloved (and shocking) actors left.
Jesse Spencer as Matthew Casey – Chicago Fire
Jesse Spencer portrayed Captain Matthew Casey, a core figure from the pilot episode, for 10 seasons and over 200 episodes. His 2021 exit in the milestone 200th episode saw Casey move to Oregon to care for his late friend’s sons, avoiding foster care separation.
Spencer revealed it was a “difficult decision” after loving the show from the start. Having done network TV for 18 years straight, he wanted to pursue other projects and focus on family. He discussed it amicably with showrunner Derek Haas, who agreed it was time. Casey has returned for guest appearances, including weddings and crossovers, keeping the door open.
This exit marked one of the biggest shocks for fans, as Casey was a foundational character alongside Kelly Severide.
Kara Killmer as Sylvie Brett – Chicago Fire
Kara Killmer joined as paramedic Sylvie Brett in Season 2 (2014) and became a fan favorite for her warmth and resilience. She left in Season 12 (2024), marrying Casey and moving to Oregon in a heartfelt episode.
Killmer noted the “writing was on the wall” for years, especially after Spencer’s exit built their relationship arc over three seasons. She chose to depart to explore new roles after a decade, aligning with her character’s need for fresh beginnings.
Eamonn Walker as Wallace Boden – Chicago Fire
Eamonn Walker‘s Chief Wallace Boden was the moral anchor of Chicago Fire from Day 1. His departure (announced around 2024-2025) stunned fans, as Boden embodied leadership and wisdom.
Reports indicate it stemmed from a mix of personal choice after years of commitment and production shifts toward newer dynamics. Walker’s exit allowed the show to evolve Firehouse 51’s leadership.
Tracy Spiridakos as Hailey Upton – Chicago P.D.
Tracy Spiridakos played Hailey Upton from Season 4 through Season 11. Upton exited to pursue more fulfilling law enforcement opportunities outside the Intelligence Unit.
Spiridakos described it as a tough but necessary choice to explore new creative paths after seven years. Her departure mirrored real-life desires for change, and it was handled mutually with producers.
Jesse Lee Soffer as Jay Halstead – Chicago P.D.
Jesse Lee Soffer‘s Jay Halstead left in Season 10 after a long run. The character went undercover and didn’t return, allowing Soffer to pursue other projects.
This exit was amicable, though fans speculated on contract or creative factors.
Other Notable Exits Across the Franchise
- Chicago Med: Brian Tee (Ethan Choi), Nick Gehlfuss (Will Halstead), and Guy Lockard (Dylan Scott) left in recent seasons for new opportunities or story conclusions. Rachel DiPillo’s Sarah Reese exit remains mysterious.
- Chicago Fire Recent 2025 Departures: Jake Lockett (Sam Carver) and Daniel Kyri (Darren Ritter) exited amid reported budget cuts and shifting cast dynamics. Alberto Rosende (Blake Gallo) also wrapped up.
- Chicago P.D.: Sophia Bush (Erin Lindsay) cited alleged mistreatment on set in past interviews, leading to a contentious exit. Jon Seda (Antonio Dawson) left for family/drug storyline reasons.
Many exits involve mutual agreements, with doors left open for returns—common in Dick Wolf procedurals.
The Impact of These Departures on the Franchise
Cast turnover keeps One Chicago fresh. New characters introduce conflicts, romances, and growth, preventing repetition. Crossovers maintain unity, while emotional goodbyes (like weddings or relocations) provide satisfying closure.
Fans often mourn favorites, but the franchise’s resilience lies in its ensemble strength and real-world-inspired stories. As of 2026, with stars like Taylor Kinney (Severide), Jason Beghe (Voight), and Oliver Platt (Charles) staying, the shows continue thriving.
Conclusion
The real reasons actors leave the One Chicago franchise boil down to personal growth, family priorities, career evolution, and the natural cycle of long-running TV. While some exits sting, they allow the series to evolve, introducing new heroes to Chicago’s front lines. The franchise’s enduring popularity proves that change—though bittersweet—fuels compelling storytelling.
Whether through heartfelt farewells or shocking twists, these departures remind us that even in TV, life moves on. What’s your favorite One Chicago exit storyline? Share in the comments!