A Chicago Fire spinoff centered around Taylor Kinney's character, Severide, was considered but ultimately not pursued due to a specific reason. Kinney, who plays Kelly Severide, has been a part of the NBC procedural since its debut episode in 2012. During the eleventh season, the actor took a personal leave of absence but returned for season 12, making a high-profile comeback.

Showrunner Andrea Newman shared with HELLO! that Kinney's hiatus had a significant impact on the potential One Chicago franchise spinoff focusing on Severide. The idea of a Severide-centric spinoff was on the table, especially centered around the Office of Fire Investigation (OFI) department.

In the season 12 premiere, titled "Barely Gone," Severide's return was explored, along with the strained relationship with Stella Kidd (Miranda Rae Mayo). Despite a steamy shower shared by the couple, trouble arose when Severide reignited his interest in arson investigations. Kidd expressed concerns about Severide's return home and the impact on their relationship, emphasizing the need to rebuild trust.

As the season progresses, Severide's instinct to investigate potential crises complicates his marriage further, indicating a need for time to recover. While a character-focused spinoff has succeeded within the Chicago Fire universe, Severide's importance to the main series remains evident. Fans can catch Chicago Fire season 12 every Wednesday on NBC and Peacock, eagerly anticipating Taylor Kinney's continued presence in the show.