This is not a drill, Chicago Fire fans: Eamonn Walker is guest-starring as the beloved Chief Wallace Boden in tonight's (April 16) episode! It's set to be a thrilling reunion among the firefighters.

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Eamonn Walker had a long run as Chief Boden on the Chicago Fire cast. Pic credit: Elizabeth Morris/NBCUniversal The Chicago Fire season finale featured a fond farewell to Chief Wallace Boden. Fans ...

Eamonn Walker at arrivals for NBC Network Upfronts 2015 – Part 2, Radio City Music Hall, New York, NY May 11, 2015. Photo By: Gregorio T. Binuya/Everett Collection — Photo by everett225 *After 12 ...

After a multitude of cast exits in the One Chicago universe, Eamonn Walker is returning in the role of Wallace Boden — but for how long? Walker, 62, is coming back in the April 16 episode of the hit ...

The actor left the series he starred on for 12 seasons last year. By Jackie Strause Managing Editor, East Coast First Deputy Commissioner Wallace Boden is back for one night only in the upcoming ...

Eamonn Walker will be leaving Chicago Fire at the end of Season 12. The character will not be killed off, leaving space for him to return. Details about this decision will be revealed in the season ...

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Eamonn Walker in close up in an episode of Chicago Fire Image via NBC Wallace Boden has only been gone from Chicago Fire for less than a season, but the fan-favorite character has been sorely missed ...