Dermot Mulroney will not return as a regular on NBC’s Chicago Fire for the full run of Season 15, the show’s producers confirmed to TVLine — a change that reshapes leadership at Firehouse 51 and arrives as the franchise prepares for a new fall lineup. The chief’s exit is slated for early in the new season, altering the opening chapters viewers will see when the series resumes.
TVLine reported the departure, and industry outlet Deadline first broke the news. Mulroney portrayed Battalion Chief Dom Pascal, a character introduced in Season 13 to succeed Eamonn Walker’s Wallace Boden as the head of Firehouse 51.
How Pascal’s arc ended up here
When Pascal arrived he ran a tight, by-the-book shop — a style that caused friction with some of the firefighters before he gradually earned their respect. Mulroney stepped away from the series during Season 14 after Pascal was arrested and subsequently fired for what producers described as “unbecoming conduct.” The character did return for the Season 14 finale, which left several crew members in peril inside a burning structure.
The decision to write Pascal out early in Season 15 closes that chapter and sets the stage for the season premiere to address both his fate and the leadership vacuum at the firehouse.
What viewers should expect first night back
The show returns Wednesday, October 7, at 9 p.m. on NBC, keeping its regular slot between Chicago Med and Chicago P.D. Early episodes will likely pick up the emotional and logistical fallout from the Season 14 cliffhanger and explain Pascal’s exit in-screen.
- Actor: Dermot Mulroney
- Role: Battalion Chief Dom Pascal
- Tenure on the show: Joined in Season 13; recurring through Season 14
- Exit timing: Early in Season 15
- Premiere: Wednesday, October 7 at 9 p.m. ET on NBC
For a series that has long balanced ensemble drama with procedural action, losing a senior officer on-screen has practical storytelling implications: who will step into command, how team dynamics will shift, and whether the show will use this as a launch point for new or returning characters. Those are the questions Season 15 will need to answer in its opening weeks.
Mulroney’s casting drew attention when he first arrived, bringing star power and a more rigid command style to the ensemble. His exit marks the latest cast change for a franchise that routinely refreshes its roster while maintaining interconnected storylines across its three series.
| Detail | Information |
|---|---|
| Confirmed by | TVLine (initial report by Deadline) |
| Character status | Written out early in Season 15 |
| Next episode | Season 15 premiere — Oct. 7, 9 p.m. ET on NBC |
Expect more concrete answers about Pascal’s departure once the season begins; until then, his exit is one of several narrative shifts that could alter Firehouse 51’s chain of command and the show’s emotional center.
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Hello, I’m Beckett. I cover series and show news for you to make your evenings more captivating.