is an American television police drama series broadcast by NBC and created by Dick Wolf as the second installment of the Chicago franchise.

It stars Jason Beghe, Jon Seda, Sophia Bush, Jesse Lee Soffer, Patrick Flueger, Marina Squerciati, LaRoyce Hawkins, Archie Kao, Elias Koteas, Amy Morton, Brian Geraghty, Tracy Spiridakos, Lisseth Chavez, Benjamin Levy Aguilar and Toya Turner, it aired from January 8, 2014 to present.

The show follows the uniformed patrol officers and the Intelligence Unit of the 21st District of the Chicago Police Department as they pursue the perpetrators of the city's major street offenses.

focuses on the fictional 21st District, which houses patrol officers and the department's elite Intelligence Unit, led by Sergeant Hank Voight (Jason Beghe) through their action-packed daily lives as they strive to keep the city peaceful.

At the 2016 Television Critics Association winter press tour, NBC Entertainment president Jennifer Salke revealed that the network had discussions with Dick Wolf about a fourth series in the Chicago franchise centered on the legal system.

[32] Rocky alum Carl Weathers played Cook County State's Attorney Mark Jefferies, while Joelle Carter also starred.

Deadline Hollywood revealed that the proposed spin-off would involve the Chicago Police Department, and would be created and executive produced by Dick Wolf, Derek Haas, Michael Brandt, and Matt Olmstead.

[58] Cast members include Jason Beghe as the Intelligence team leader Sergeant Hank Voight and Jon Seda as Detective Antonio Dawson.

On June 13, 2013, it was announced that Melissa Sagemiller would no longer be a part of the show and Jesse Lee Soffer officially joined the cast as a series regular.

[63] On August 23, 2013, Patrick Flueger and One Tree Hill star Sophia Bush joined the cast as Officer Adam Ruzek and Detective Erin Lindsay, respectively.

[67] On October 21, 2013, Stella Maeve was cast in a recurring role as Nadia, a pretty 18-year-old escort who is addicted to heroin and goes through a very difficult withdrawal.

[107] Ray Rahman of Entertainment Weekly gave the drama a favorable review: "It's hard to imagine the series capturing the compelling, can't-watch-just-one magic that makes the Law & Order franchise so marathonable, but it moves just fast enough to keep you from changing the channel in search of an SVU re-run.

is, in many ways, a throwback to an earlier, male-dominated era of crime shows, yet it carves out room for strong female characters who are good at their jobs and taken seriously by their colleagues.

"[44] Robert Bianco of USA Today expressed disappointment: "When did Wolf's work, which used to show some grace and wit, become this ugly, plodding and crass?