Dermot Mulroney Joins 'Chicago Fire' as New Fire Chief

Mulroney's character, Dom Pascal, brings a fresh leadership style to Firehouse 51 following Eamonn Walker's departure as series regular.

Eamonn Walker's character, Wallace Boden, was promoted and will appear as a guest star.
Christopher Herrmann was initially tapped as Boden's successor but has yet to be promoted.
Mulroney's character previously served as a fire chief in Miami before returning to Chicago.
The new season will address several character exits and new dynamics at Firehouse 51.
'Chicago Fire' Season 13 premieres on September 25 on NBC.