Spiridakos has played Detective Hailey Upton Halstead since season 4.
Chicago P.D.is saying goodbye to one of its own.
Spiridakos has appeared on theNBCshow since its fourth season, when she joined as a recurring character.
Tracy Spiridakos in ‘Chicago P.D.'.Lori Allen/NBC
She later became a series regular starting in season 5.
Her character also appeared on the seriesChicago Fire,Chicago Med, andFBI.
With her departure, she becomes the second Halstead to leave the show.
“This is sad but true,” the actor tweeted at the time.
“Just want all the fans to know how grateful I am.
You guys are why we do it!
It has been an honor.
Love you all.”
(He did return to directan episode of the procedural, however.)
For her part, Spiridakos has not yet publicly weighed in on her departure.
