The fourth season of police procedural drama series Chicago P.D. which originally aired on NBC from September 21, 2016 to May 17, 2017. The season consists 23 episodes.
Li Jun Li joins the cast as Officer Julie Tay for a three episode guest spot. She is set to replace Brian Geraghty's character Officer Sean Roman as Officer Kim Burgess' (Marina Squerciati) partner, after he left the series at the end of last season. On September 28, it was reported that Jon Seda as character Antonio Dawson would move from P.D. to Justice, where Antonio will become an investigator for the SA's office. It was further reported on October 5 that Seda's last episode of P.D. will be episode 8.
Nick Wechsler joins the cast as Kenny Rixton, a former protégé of Voight's, for a multi-episode arc. On February 7, 2017, it was revealed that Esai Morales will join the cast as Chief Lugo, a veteran of the Police Department who is trying to steer the CPD into a new style of policing. His first appearance will be in the three-way crossover with Chicago Fire and Chicago Justice, before recurring throughout the remainder of the season.
Set to recur as Hailey Upton, a robbery homicide Detective, Tracy Spiridakos joins the cast, with her first episode slated to air in early May. Squerciati took maternity leave from the show in March 2017, and Kim made her temporary departure in "Last Minute Resistance".
- The Silos
- Made a Wrong Turn
- All Cylinders Firing
- Big Friends, Big Enemies
- A War Zone
- Some Friend
- 300,000 Likes
- A Shot Heard Around the World
- Don't Bury This Case
- Don't Read the News
- You Wish
- I Remember Her Now
- Seven Indictments
- Favor, Affection, Malice or Ill-Will
- Emotional Proximity
- Remember the Devil
- Little Bit of Light
- Last Minute Resistance
- Grasping for Salvation
- Army of One
- Fork in the Road
A crossover starting on Chicago Fire and concluding on Chicago PD aired on January 3, 2017.
- Chicago P.D. - Season 4 Episode 9 - Don't Bury This Case
- Chicago Fire - Season 5 Episode 9 - Some Make It, Some Don't
- Chicago Fire - Season 5 Episode 15 - Deathtrap
- Chicago P.D. - Season 4 Episode 16 - Emotional Proximity
- Chicago Justice - Season 1 Episode 1 - Fake
The DVD release of season four is set to be released in Region 1 on September 12, 2017.