With the show currently in its tenth season, Jesse Spencer made the decision to move on from "Chicago Fire" just before the new season aired. "We had an open secret basically on set," he told TV Insider. Spencer called the show's creator Derek Haas to make sure Casey appeared in at least 200 episodes.
"It was a difficult decision because I've loved the show from the start," Spencer continued, "but there's other things that I would like to do in the future and there's some family that I need to take care of and 18 years is a long time." This is in reference to the amount of time that Spencer has been on network television, which includes his tenure on "House, M.D." Basically, the actor hasn't had a proper break up until this point (via IMDb).
As for why Casey has the luxury of surviving network television, that's down to Spencer, Haas, and the writers. His exit storyline "felt like full circle" according to Casey, as they "didn't want to kill Casey." But why Darden's kids? "He made a strong connection with the kids and then he always wanted kids," the actor explained, adding that this was "a really reasonable way for Casey to organically leave the show."
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