'Chicago P.D.': Tracy Spiridakos Joins as Series Regular After Sophia Bush's Exit

CHICAGO P.D -  Episode 423 - Tracy Spiridakos -Publicity-H 2017
Matt Dinerstein/NBC

Det. Hailey Upton is sticking around at Chicago P.D.

Revolution alum Tracy Spiridakos has been promoted to series regular for the NBC cop drama's fifth season, The Hollywood Reporter has learned.

Spiridakos made her debut in the two of the last three episodes of P.D.'s fourth season when her character, a robbery/homicide detective, collaborated with Sgt. Hank Voight (Jason Beghe) and the rest of Intelligence on a particularly tough case. Although she and Voight initially butted heads, in the end, he offered her a spot on the team if she was ever interested.

Upton is described as someone with killer instincts, humor and smarts. Always clocking in overtime, she got her detective shield meritoriously on the heels of an undercover assignment that is still shrouded in secrecy, and as a result has had to prove herself to those who thought she didn't earn the detective promotion. 

In addition to Upton's move to Intelligence, the unit will welcome back former team member Det. Antonio Dawson (Jon Seda). The character left midway through season four to work for the State's Attorney's office when Seda became a series regular on the since-canceled Chicago Justice. 

Chicago P.D., however, will return another important player: leading lady Sophia Bush. The longtime star exited the series after her character was mulling an offer to move to New York in the season four finale for an undercover assignment with the FBI's counter-terrorism unit in order to protect her troubled mother, Bunny (Markie Post), who had become embroiled in a murder investigation.

The potential job change also came just as Lindsay's on-and-off boyfriend, Det. Jay Halstead (Jesse Lee Soffer), was thinking about proposing.

Spiridakos will no doubt fill a huge part of the void left by Bush's departure, as will Marina Squerciati, who has been with Chicago P.D. from the beginning and recently saw her character promoted upstairs midway through season four.

Additionally, Mykelti Williamson (Justified) will recur in season five, reprising his role as Voight's old partner.

Behind the scenes, Chicago P.D. will see former Law and Order: SVU showrunner Rick Eid take over for co-creator Matt Olmstead, who left at the end of season four for a lucrative overall deal at ABC Studios.

Before heading to the Windy City, Spiridakos' other credits include a starring role on NBC's Revolution as well as roles on Showtime's Episodes and A&E's Bates Motel. She is repped by Gersh and Authentic Management.

Chicago P.D. returns for its fifth season Wednesday, Sept. 27 at 10 p.m. on NBC.