Walker’s Wallace Boden was last seen onscreen in the season 12 finale

Eamonn Walker is back on Chicago Fire for one night and one night only

The beloved actor, 62, who exited the series after 12 seasons as a series regular last May, will reprise his role as Wallace Boden, who is now First Deputy Commissioner of the Chicago Fire Department, in an April 16 episode.

The episode will see Boden “tasked by Commissioner Grissom (Gary Cole) to run a post-incident analysis following a house fire that collapsed with a firefighter inside.

In a statement, showrunner Andrea Newman said they’re “so excited to have our beloved Chief Boden back, and the episode, titled ‘Post-Mortem,’ is a thrill ride unlike any we’ve done before.”

She continued of what’s to come, “Told with flashbacks and unique POVs, Chief Boden leads our team on a search to discover the how, who, and why of a fierce firefight that ended in disaster.”