The highly awaited 2025 One Chicago crossover could bring heartbreak for Chicago Fire fans, particularly for Kelly Severide. This year’s event, the first major crossover in five years, unites Chicago Fire, Chicago PD,

and Chicago Med in a gripping storyline centered around a catastrophic transportation disaster in Chicago. While the One Chicago series have focused on separate narratives recently, this crossover leans heavily into character-driven drama.

Among those at the center of the crisis, Severide seems poised for a devastating loss.

A Devastating Clue in the Trailer

NBC’s official trailer for the 2025 crossover teases intense action and emotional turmoil. A massive train crash takes center stage, with several characters caught in the chaos. A particularly gut-wrenching moment shows Severide in tears, hinting that he may be experiencing a profound personal loss.

It’s already confirmed that Stella Kidd and Chicago PD’s Adam Ruzek are among those trapped in the wreckage. However, given Severide and Kidd’s history of surviving dire situations together, it’s unlikely that his breakdown is solely due to fear for his wife’s safety. Instead, speculation is mounting that his emotional turmoil could be linked to the tragic fate of his estranged brother, Jack Damon.

Jack Damon’s Possible Fate

Jack Damon, introduced in Chicago Fire Season 12 as the secret son of Benny Severide, had a rocky journey in Firehouse 51. Despite forming a tentative bond with Kelly, Damon’s rebellious nature and conflicts with Stella Kidd ultimately led to his dismissal by Chief Dom Pascal.

Since leaving Firehouse 51, Damon has continued his career as a firefighter, making it highly plausible that he’s either responding to the train disaster or involved in the crash itself. If Damon is among the victims, Severide’s grief could be overwhelming, particularly because they never fully reconciled before tragedy struck.

How This Could Change Severide’s Future

The loss of Jack would mark a major turning point for Severide. Having only recently reconnected with his half-brother, he may struggle with guilt over their unresolved issues. This grief could push him to reconsider his priorities and potentially rethink his own future.

One significant possibility is that Severide may develop a stronger desire to start a family. His role as a mentor to Damon suggested that he was beginning to embrace the idea of guiding someone younger. However, such a decision should come from a place of personal growth rather than a reaction to tragedy.

Stella Kidd’s perspective on this could also play a crucial role. Given that she will be recovering from the trauma of the train disaster, she may not be emotionally prepared for such a shift. Their ability to navigate this challenge together could become a pivotal storyline for Chicago Fire moving forward.

Chicago Fire’s History of Heartbreak

If Damon’s death happens, it would align with Chicago Fire’s pattern of delivering shocking and emotional exits. The series has never shied away from portraying the dangers that first responders face. The last major character loss occurred when Chief Evan Hawkins tragically died, leaving Violet Mikami devastated.

While it’s unlikely that the show would take out a key figure like Severide or Kidd, Damon’s loss could serve as a powerful emotional catalyst. His connection to Severide ensures that the impact would be deeply felt, both within the show and by its viewers.

As the One Chicago crossover draws near, fans should prepare for an intense, emotionally charged event. With high-stakes action and potential life-altering consequences, this crossover could leave Severide forever changed.