The Firehouse 51 Shake-Up: Who’s In, Who’s Out, And The Shocking Baby News For The Cast Of Chicago Fire Season 13

The landscape of Firehouse 51 is undergoing its most dramatic transformation in years, with the latest updates for the cast of Chicago Fire Season 13 confirming major departures, a new, high-profile Battalion Chief, and a storyline that will change one of the show’s most beloved couples forever. As of December 2025, the long-running NBC procedural is leaning into its character drama more than ever, ensuring that fans of the One Chicago universe have plenty of fresh, high-stakes action to look forward to. The new season has ushered in an era of uncertainty and excitement, proving that even after more than a decade, the show can still deliver shocking twists and emotional gut-punches.

The biggest news swirling around the firehouse involves the shocking promotion of a fan-favorite paramedic to a series regular, the exit of two key firefighters, and a massive plot twist for Lieutenant Kelly Severide and Lieutenant Stella Kidd. This guide provides the most current information on the main cast, their real-life profiles, and the crucial character arcs that define the current season. From the return of Taylor Kinney to the introduction of a new authority figure, Firehouse 51 is anything but quiet.

Complete Biography Profile of the Main Returning Cast Members

The heart of Chicago Fire remains with its veteran actors, whose commitment to their roles has made their characters staples in the One Chicago universe. Here is a look at the core cast, including their recent career highlights and personal backgrounds.

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• Taylor Kinney (Lieutenant Kelly Severide)
  • Born: July 15, 1981, Lancaster, Pennsylvania.
  • Career Highlights: Kinney began his career as a model before landing roles in TV series like The Vampire Diaries (as Mason Lockwood) and films such as Zero Dark Thirty and The Other Woman. He has anchored Chicago Fire since its 2012 premiere.
  • Recent Updates: After a brief hiatus, Kinney returned to Firehouse 51, and his character, Kelly Severide, has been heavily featured in Season 13, particularly concerning his relationship with his wife, Stella Kidd. Kinney is also known for starring in the indie feature Blue Bayou.
• Miranda Rae Mayo (Lieutenant Stella Kidd)
  • Born: Fresno, California.
  • Career Highlights: Mayo moved to Los Angeles after high school to pursue modeling and acting. She starred as Lacey Briggs on the ABC series Blood & Oil before joining Chicago Fire in 2016. Her character, Stella Kidd, has risen through the ranks to become Lieutenant of Truck 81.
  • Recent Updates: Off-screen, Mayo is a dedicated advocate for mindfulness and serves as a board member for the Holistic Life Foundation, promoting mental and emotional well-being. On-screen, her character is navigating a massive new chapter with Severide.
• David Eigenberg (Lieutenant Christopher Herrmann)
  • Born: May 17, 1964, Manhasset, New York.
  • Career Highlights: Eigenberg is instantly recognizable to many for his long-running role as Steve Brady, the good-hearted husband and bar owner in the HBO series Sex and the City and its revival, And Just Like That.... He has played the beloved, often comedic, but fiercely loyal Christopher Herrmann since Chicago Fire began.
  • Recent Updates: As a veteran Lieutenant and co-owner of Molly’s Pub, Herrmann continues to serve as the paternal figure of the firehouse, with his character often providing the emotional anchor and comic relief amidst the high-stakes drama.
• Christian Stolte (Firefighter Randy “Mouch” McHolland)
  • Role: The veteran firefighter and Truck 81’s resident couch potato, known for his long-standing marriage to Trudy Platt from Chicago P.D.
• Joe Miñoso (Firefighter Joe Cruz)
  • Role: A dedicated firefighter, Squad 3 member, and inventor of the "Slamigan," Cruz continues to balance his intense job with his role as a husband and father.

Major Cast Shake-Ups: New Chief and Shocking Departures

Season 13 has delivered a significant shake-up to the Firehouse 51 command structure and roster, following the emotional exit of a long-time leader and the surprising decision of two younger cast members to move on.

The Arrival of Battalion Chief Dom Pascal

The most immediate and impactful change to the firehouse dynamic is the arrival of the new Battalion Chief, Dominick "Dom" Pascal, portrayed by veteran actor Dermot Mulroney. Pascal steps into the massive void left by the departure of Captain Wallace Boden (Eamonn Walker), who stepped down from his role as a series regular. Mulroney, known for his extensive career in films like My Best Friend’s Wedding, brings a new, potentially disruptive energy to the station. His character, Chief Pascal, is expected to challenge the established norms at Firehouse 51, forcing the remaining Lieutenants, Severide and Kidd, to adapt to a different style of leadership in Battalion 25.

Two Key Firefighters Are Exiting Firehouse 51

In a move that stunned fans, two prominent younger cast members are reportedly set to exit the series following the conclusion of Season 13.

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• Daniel Kyri (Firefighter Darren Ritter): Kyri, who plays the earnest and dedicated Firefighter Ritter, is reported to be departing the show. Ritter has been a fan favorite, known for his close relationship with Mouch and his steady presence on Engine 51. His exit marks a significant loss for the show's next generation of firefighters.
• Jake Lockett (Firefighter Sam Carver): Lockett, who played the charismatic and often troubled Sam Carver, is also reportedly leaving the series. Carver's storyline in Season 13 had been expanding, with him returning from a furlough and receiving a bigger character arc, making his departure even more surprising.

These exits, coupled with the promotion of Paramedic Jocelyn Hudon (Lyla Novak) to a series regular, signal a major restructuring of the Firehouse 51 team, particularly within the Ambulance and Engine crews.

The Biggest Season 13 Storyline: A Baby for Severide and Kidd

While the cast changes provide plenty of external drama, the most significant and heartwarming development comes from the personal lives of the firehouse’s power couple, Kelly Severide and Stella Kidd. After a season of navigating career challenges and the inherent dangers of their jobs, the couple known as "Stellaride" is set to welcome a new member to their family.

The news that Kidd and Severide are having a baby is a massive, game-changing update for the series. This storyline has been carefully built up, with the couple discussing their future and starting to plan for a family at the beginning of Season 13. This development is a testament to the stability and maturity of the "Stellaride" relationship, which has overcome numerous obstacles, including Severide's brief, secretive absence and Kidd's struggle to acclimate to her new leadership role.

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The introduction of a baby will undoubtedly impact their high-risk careers, adding a new layer of emotional depth and tension as they balance parenthood with their commitment to the Chicago Fire Department. The arc is seen by critics as a way to save and solidify the couple’s flailing relationship, providing a wonderful new direction for two of the show's most central characters.

The One Chicago Universe: 2025 Crossover Event

For fans of the interconnected Dick Wolf universe, the biggest event of the year was the rare three-show crossover. The One Chicago Crossover Event on Wednesday, January 29, 2025, brought together the casts of Chicago Fire, Chicago P.D., and Chicago Med for a gripping, three-hour narrative.

This major event, the first three-show crossover in five years, showcased the seamless integration of the three series, with characters like Lieutenant Stella Kidd and Detective Adam Ruzek (from Chicago P.D.) finding themselves in danger during the first hour. The crossover provided an intense, A+ rated storyline that demonstrated the unique strength of the One Chicago franchise. This event solidified the topical authority of the franchise, proving that the synergy between Firehouse 51, the 21st District, and Gaffney Chicago Medical Center remains a massive draw for viewers.

The consistent success of the series, heading into a confirmed Season 14 (premiering in October 2025), is a testament to the dedicated work of the cast and the fresh, ever-evolving storylines. From the dramatic changes in command to the emotional milestones for its core couples, Chicago Fire continues to be a cornerstone of procedural television.