01/03/2018 (10:00PM – 11:00PM) (Wednesday) : HALSTEAD PUTS HIS CREDIBILITY AND CAREER ON THE LINE TO HELP SOLVE A CASE WITH TIES TO HIS NEW GIRLFRIEND. Halstead’s (Jesse Lee Soffer) partying with Camila (guest star Anabelle Acosta) unintentionally puts him in the middle of a drug-related homicide. He’s forced to choose between loyalty to his unit and his girl. Meanwhile, Voight (Jason Beghe) finally discovers the mole in his unit. Also starring Jon Seda, Patrick John Flueger, Elias Koteas, Marina Squerciati, LaRoyce Hawkins, Amy Morton and Tracy Spiridakos. Guest starring Mykelti Williamson, Celeste M. Cooper and Johnny Ferro.