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The actor departed NBC's firefighter drama on Wednesday's 200th episode.
The actor and showrunner Derek Haas discuss Wednesday's monumental 200th episode and the story behind the surprising departure.
The creator of the 'Law & Order,' 'Chicago' and 'FBI' franchises opens up to ET about making must-see TV.
Executive producer Derek Haas promises 'characters you haven't seen since the early days' will be back for the 200th episode.
Showrunner Derek Haas looks ahead to the milestone episode in season 10.
Showrunner Derek Haas breaks down the 'eye-opening' moment that may force Casey to finally make some decisions.
Executive producer Derek Haas looks ahead to the 'big' season closer.
ET exclusively debuts a first look from Wednesday's episode.
A brand new episode airs Wednesday, March 10 at 9 p.m. ET/PT on NBC.
ET spoke with the stars from all three 'Chicago' franchise shows airing weekly on NBC.
Taylor Kinney, Miranda Rae Mayo and Kara Killmer discuss matters of the heart at Firehouse 51.
Showrunner Derek Haas breaks down Wednesday's winter return.
ET exclusively debuts a first look from Wednesday's new episode.
The One Chicago firefighter drama airs Wednesdays at 9 p.m. ET/PT on NBC.