Overview

• 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.