Jesse Spencer as Matthew Casey

Jesse Spencer Was a Series Regular on House Before He Took up Residency at Firehouse 51 as a Lieutenant-Turned-Captain Matt Casey. Spencer Took a Brief Hiatus from the Series in Season 10, but Returned for the Season 11 Finale.

Taylor Kinney as Kelly Severide

In Charge of Squad 3, Severide Is Only Third in Command to Chief Boden and Best Friends with Lieutenant Casey. During Season Four of the Series, He Began Dating Fellow Firefighter Stella Kidd and the Two Eventually Married in Season 10. Kelly’s Future in Firehouse 51 Is Unclear, but Since He’s Become a Fan Favorite over the Year's, He’ll Hopefully Return for Season 12.

Eamonn Walker as Wallace Boden

Battalion Chief Wallace Boden Is a Source of Strength and Support for Everyone at Firehouse 51. While He Never Hesitates to Risk His Own Life for Those on His Team, He’s Also a Dedicated Family Man.

Miranda Rae Mayo as Stella Kidd

In Season Four, Fans of Chicago Fire Were Introduced to Stella Kidd, Starting out at the Firehouse as a Temporary Driver on Truck 81. She Later Became a Permanent Driver After the Tragic Death of a Co-Worker. Kidd Also Rose from Recurring to Main Character. Moving on up in Season Nine, Kidd Was Promoted to Lieutenant While Also Getting Engaged to Lieutenant Kelly. the Two Tied the Knot in Season 10.

David Eigenberg as Christopher Herrmann

David Eigenberg Plays Christopher Herrmann, the Firefighter Who Rose Through the Ranks to Eventually Become the Officer in Charge of the Whole Engine Company 51. Like Chief Boden, Herrmann Is Seen as a Strong Father Figure to His Team, Often Giving Advice and Acting as a Team Leader. When His Wife Fell Ill, Herrmann Became More Open and Accessible to Others, Revealing His Vulnerability.

Christian Stolte as Randall “Mouch” Mcholland

One of the Senior Firefighters on Truck 81, Mcholland Is Often Seen Lazing Around the Station When Not on Duty. However, He’s Always a Source of Support for His Co-Workers and Fans Were Delighted When He Married Sergeant Trudy Platt. After the Last Season, We Can’t Say for Sure Whether He’s Returning to Season 12, but We’re Hoping He Does.

Joe Minoso as Joe Cruz

Cruz Grew up Watching Gang Violence All Around Him, but He’s an Honorable and Loving Person, Both at Work as a Firefighter and in His Home Life, Where He Eventually Marries and Has a Child.

Kara Killmer as Sylvie Brett

Sylvie Brett Went from Small-Town Girl to Big-City Woman When She Moved to Chicago and Joined the Chicago Fire Universe. Kara Killmer Joined the Cast as the Paramedic Who Replaced Leslie Shay (Lauren German) in the Premiere of Season Three. Eventually, She Moved up to Become Paramedic in Charge on Ambulance 61. While She’s Reported to Be Leaving in the New Season, We’re Looking Forward to Seeing What’s in Store Before She Goes.

Chicago Fire Cast: Catch up with the Firehouse Stars

By James H. Sterling

• Oct 9, 2026 • 6 min read

Chicago Fire Cast: Catch up with the Firehouse Stars

Direct Answer • Key Takeaway

Going into Its 12Th Season While Many Tv Dramas Have Had Waning Audiences, Nbc’s Chicago Fire and Its Cast Remains a Hot Commodity with a Successful Formula of Heartwarming and Often Heartbreaking Stories. the Show, Which Has Aired over 200 Episodes Since Debuting in 2012, Is So Successful That It’s Spawned Two Popular Spinoffs, Chicago P. D. and Chicago Med.

James H. Sterling

Environmental Science & Climate Journalist

James Sterling reports on renewable energy developments, climate policy, ecological conservation, and green tech innovations around the globe.

Tags: chicago fire cast