Sophia Bush has broken her silence on the reason for departing Chicago P.D. after four seasons. Responding to an Instagram comment, she claimed, “I left because I wanted to. End of story.” Bush, the former female lead on the series, responded to an Instagram discussion of her exit, dismissing various theories. “Took me a long time and a lot of hard work to get out of that show,” she writes. “Please don’t demean my capabilities by degrading my position.