Nick Wechsler

Reese throws a party at home when Hal and Lois take a romantic break, but the delinquent friends of Francis gatecrash and hold the boys hostage.

When a sex offender is found dead and mutilated, Intelligence look into a private police force that may be covering up illegal activities; Halstead runs a DNA check on Jimmy and discovers he is not Erin's father.

When Olinsky catches wind of a grieving father looking to avenge his daughter's death, he goes undercover as a hit man.

The investigation of a jogger's brutal murder in a park is blocked by a church offering sanctuary to the prime suspects; Rixton goes behind Voight's back to question a gang member in relation to the case.

Lilly reopens a case involving the death of a reclusive college student, who died in an on-campus fire, when photographic evidence is revealed that suggests her death may not have been an accident.

Halstead goes undercover to investigate the death of a teen who ran away from a treatment centre for troubled girls.