Once NBC announced that Tracy Spiridakos was leavingChicago PDafter season 11, the show hunted for her character’s replacement, butHailey Upton’s first successor didn’t stick around for long.ManyChicago PDcharacters have come and goneover the course of the police procedural’s 12 seasons. From Sophia Bush as Erin Lindsay to Jon Seda as Antonio Dawson, numerous stars have exited the series, meaning the makeup of the Intelligence Unit constantly changes. Unfortunately, the squad lost one more member during theChicago PDseason 11 finale.
NBC releases new episodes ofOne Chicagoon Wednesdays, withChicago Medseason 10 at 8 pm ET,Chicago Fireseason 13 at 9 pm ET, andChicago PDseason 12 at 10 pm ET.

Spiridakos' Upton leftChicago PDafter season 11. During the finale, Upton and Hank Voight decide that the best thing for her would be to quit Intelligence and move out of Chicago. Upton had been struggling since her husband, Jay Halstead, left her. Voight knew that Upton, who had become like a daughter figure to him, needed a change. Even though Voight certainly didn’t want Upton to go, he pushed her to, so she did. Just like that,Intelligence was down one detective, and many assumed that one new character introduced inChicago PDseason 11 would fill that vacancy.
Chicago PD Season 11 Set Up Jo Petrovic As Hailey Upton’s Replacement
Bojana Novakovic Starred As Jo
Chicago PDseason 11, episode 7, “The Living and the Dead,” introduced Bojana Novakovic as Josephine “Jo” Petrovic. Voight recruitedJo, an SVU detective and profiler,to help Intelligence with a serial killer case. In episode 8, Upton called on Jo for assistance once more. Jo returned again in episode 10, which featured Upton discovering that the newChicago PDcharacterwas an alcoholic.
Jo worked closely with Upton, and it would only be natural if she took her spot in Intelligence.

Upton helped Jo get sober by the end ofChicago PDseason 11, and it really felt like the show was setting up Novakovic as Spiridakos' replacement in the cast oftheOne Chicagoshow. Jo worked closely with Upton, and it would only be natural if she took her spot in Intelligence. However,whenChicago PDseason 12 premiered, Jo was gone.
What Sophia Bush Has Done Since Leaving Chicago PD As Erin Lindsey
Sophia Bush exited Chicago PD after season 4, and in the years since she left the show, the actress has been busy with many other projects.
What Happened To Petrovic In Chicago PD Season 12?
Jo Is Gone With No Explanation
Viewers learned during theChicago PDseason 12 premiere that Emily Martel replaced Uptonin the Intelligence Unit. Unfortunately, Martel died at the end of the episode, resulting in Voight searching for another new detective for the squad. A few episodes later,Kim Burgess took the detective’s exam and was appointed Upton’s official successor.All the while, Jo is nowhere to be seen.
Shawn Hatosy
Charlie Reid
It’s unclear what happened to Joand why she didn’t take Upton’s place in season 12. Despite showrunner Gwen Sigan tellingTVLinethat she “loved Petrovic on the show” in season 11 and thought “there’s so much depth to that character,” they decided not to bring Bojana Novakovic back. Perhaps Jo will return in a futureChicago PDepisode, but in the meantime, her whereabouts are unknown.
