That is a no-no and should never, ever happen.

And because they were left behind, possibly by the end of this episode, we may lose them.

Its one of your favorites.

Eamonn Walker returns to ‘Chicago Fire’ in Season 13 exclusive photo

Peter Gordon/NBC

Why are you guys always playing with us and scaring us into thinking our favorites might die?

EAMONN WALKER:Were not playing with you.

Its not called playing.

2025 TV Premiere Dates

“Post-Mortem” Episode 13018- (l-r) Dermot Mulroney as Chief Dom Pascal, Miranda Rae Mayo as Stella Kidd, Eamonn Walker as Wallace Boden,David Eigenbergas Christopher HerrmannNBC

We love the fact that you are so emotionally involved and that you dont want any more!

Possibly, a head will roll.

DEADLINE: Who is the firefighter that was left behind?

EW:Thats what you want to know?

Yeah, I cant tell you.

Nice try, though.

[LAUGHS] Its somebody you know and love.

You might even freak out.

DEADLINE: Will Boden be able to swoop in and save the day?

EW:Thats not his job this time.

DEADLINE: What was it like for you getting back into character?

EW:Boden lives inside of me.

My problem is stopping Boden from popping out.

[LAUGHS] It was amazing to go back.

It was amazing to put the uniform on.

Id missed everybody terribly, and the welcome that I got was second to none.

Thats what it was like, and then we went to work.

And we went to work in the way that we always work.

We knew that there was a very special episode.

DEADLINE: Boden has been gone for a hot minute, and so many things have happened.

Bodens pick to succeed him was Hermann (David Eigenberg), who has now taken the chief exam.

Will he be weighing in on any of that?

EW:With his situation as it stands, none of that stuff matters.

And you know, Bodens investigating his old favorite house, so he has got to tread very carefully.

Hes been a chief whos been on the line.

Its Pascals [Dermot Mulroney] time this time, and Im the one coming in.

Theres only one person above me, and thats the commissioner.

I am the Deputy Commissioner coming in to find out why a firefighter is left behind in the fire.

It doesnt get more intense than that.

DEADLINE: Would you say hes been aware of all thats been going on, though?

What has Boden been up to off-camera?

Hes coming in to do his job and not get caught up on the fact that somebodys in hospital.

Was this a one and done?

Its a wonderful thing to be part of theChicago Firefamily.

So Im very grateful.

EDITORS NOTE:Deadline selected the two exclusive photos in this story after speaking to Walker.

Walker is right, we are shooketh.

Chicago Fireis produced by Universal Television, a division of Universal Studio Group, in association with Wolf Entertainment.