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Chicago Fire: why did Peter Mills actor Charlie Barnett leave the show?

The actor left Chicago Fire during season three


Charlie Barnett as Peter Mills in Chicago Fire
Megan Bull
TV Writer
17 May 2023
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Charlie Barnett joined Chicago Fire in 2012. Cast as Peter Mills, an aspiring firefighter and Squad 3 member, the character appeared in seasons 1-3, before being written off in 2015. To the surprise of fans, Peter decided to leave behind his life in Chicago to work alongside his mother and sister at their restaurant in North Carolina. 

While the character left on a happy note, his departure in season three had viewers wondering why the actor decided to leave, but as it turns out, it wasn't his decision at all. Keep reading for all the details…

WATCH: Peter Mills says goodbye to Firehouse 51

In an interview with the Sarasota Herald-Tribune, Charlie recalled the moment he learned he was being written off the show, which started as "a normal day of filming".

MORE: Will Taylor Kinney ever return to Chicago Fire?

READ: NBC confirms surprising Jesse Spencer and Taylor Kinney news for season 11 finale

"They expressed that it wasn't about me or myself as an actor or my personality," he said. "But they felt that Peter had reached a plateau and the writers didn't know where to take him because he's done so much already."

Peter tends to a woman in need in Chicago Fire© Getty
Charlie was shocked after learning that his character Peter was being written off the show

Chicago Fire boss Matt Olmstead was also asked about Charlie aka Peter's exit. Standing by the decision to write his character out of the show, he told TV Guide: "The hardest part of this job is when you feel it's the right time to make cast changes. It was solely based on bringing in new people for new stories. Otherwise, it turns into a clown car. 

"You have affection and admiration for [your cast], so you keep everybody, but it's at the detriment at being objective and making some tough calls in terms of storytelling. So, we wanted to shake things up and bring in a new character and we started discussing the idea ... and here we are. It was an extremely tough decision to make, but we feel good about it." 

Charlie Barnett attends the "Shazam! Fury of the Gods" UK Special Screening at Cineworld Leicester Square© Getty
In 2022, Charlie said that leaving Chicago Fire was "a blessing in disguise"

Reflecting on the experience in 2022, Charlie later told Digital Spy: "[The show] was a behemoth that I never really saw coming. I was thankful to be a part of it. I really was sad to be let go. It broke me for quite a long time."

Remaining positive over the situation, he added: "Yeah. It was a blessing in disguise, and they all told me that. You never really see that in life, in general. You never see the bad moments becoming the good. It wouldn't be. It wouldn't be what it was, I think, if you did recognise it for what it is in the moment. So I'm thankful." Charlie also revealed that he's still in contact with his former co-stars including Yuri Sardarov and David Eigenberg. 

Charlie Barnett alongside his co-stars from The Acolyte © Getty
Charlie is set to star in The Acolyte

Following his departure from Chicago Fire, Charlie has since landed major roles as Ian Porter in Valor, Alan Zaveri on the Netflix series Russian Doll and Eric Payne in Ordinary Joe. As of 2024, the actor is set to appear in The Acolyte, a new series in the Star Wars franchise. While little is known about the project, Charlie has revealed that he's playing a Jedi Knight. Amandla Stenberg, Lee Jung-jae, Manny Jacinto and Jodie Turner-Smith are also among the cast. 

More Chicago Fire stars that have left the show

CHICAGO FIRE -- "The White Whale" Episode 721 -- Pictured: Taylor Kinney as Lt. Kelly Severide© Getty
Taylor Kinney's fate on Chicago Fire is currently unknown, however he is on a leave of absence
Jesse Spencer as Matthew Casey in Chicago Fire© NBC
Jesse Spencer departed as Matthew Casey in 2021
monica raymund as Gabriela Dawson in Chicago Fire© Getty
Monica Raymund left Chicago Fire in 2018
lauren german as paramedic Leslie Shay© Getty
Lauren German played paramedic Leslie Shay before her character was killed off in 2014
Teri Reeves as Doctor Hallie Thomas © Rex
Teri Reeves played Doctor Hallie Thomas for 11 episodes

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