Dermot Mulroney Set to Exit NBC’s “Chicago Fire” Early in Season 15, Deadline Reports

Dermot Mulroney will leave NBC’s Chicago Fire early in Season 15, wrapping his storyline sooner than the season’s production run, Deadline reported on July 31. The outlet cited sources close to the series’ production for the information and said Mulroney’s exit will be completed ahead of the season’s end.

Mulroney has appeared on Chicago Fire as a series regular since joining the cast in Season 13, when he became part of the show’s Firehouse 51 universe. On the series, he portrays Chief Dom Pascal, a role Deadline describes as beginning when he was brought in from Wolf Entertainment and Universal Television.

Deadline’s report characterizes the development as a storyline arc that will conclude earlier in Season 15 than viewers may expect from a regular cast member. It did not provide details on the specific episode count or the circumstances that will drive the character’s departure, beyond stating that Mulroney will “say goodbye” and wrap his storyline early in the season.

The report frames Mulroney’s departure as an internal production change affecting how Season 15 will handle one of its major ongoing characters. For Chicago Fire, the shift means the series will need to adjust future story lines that would otherwise rely on Chief Dom Pascal’s presence through the later portion of the season.

NBC’s Chicago Fire is produced by Wolf Entertainment and Universal Television, and the casting change is tied to that production structure, Deadline said. The outlet’s description places Mulroney’s entry into the series in its earlier Season 13 era and links his tenure as a series regular to the show’s established firefighting ensemble.

Beyond the narrative impact on Chief Dom Pascal, the earlier exit also has knock-on effects for the production schedule and on-air planning for Season 15. With Mulroney wrapping early, the show’s late-season plotting and character dynamics will shift to accommodate the absence of the character as the season progresses.

Deadline’s report did not identify what Mulroney’s next project is or when an official public announcement about his exit will come from NBC or the show’s producers. The network and production team have not been quoted in the reporting, and no additional confirmation was included in the Deadline write-up.