TV Guide USA Wednesday

Investigating the rape and murder of an undercover federal agent, the detectives are stymied by measures to protect the identities of agents in the field.

Seeking to solve the murder of a woman planning to file a paternity suit and her baby, detectives investigate the suspected father, yielding unsettling results.

The detectives investigate the decapitation of animal rights activists discovered in the city park, targeting a mentally-disturbed teenager and a rapist.

Detectives Stabler and Benson's investigation into the sexual assault of a 13-year-old girl leads them to the discovery of a secret sex club.

ADA Cabot's determination to indict a sex offender prompts her to make a decision that could allow the suspect to go free and jeopardize several careers.

The detectives search for the enemy of a judge after he is shot during an investigation into the sexual assault and murder of his 16-year-old stepdaughter.

Politics interfere as the crew tries to rescue a teenage girl after she is kidnapped by a robbery gang; Voight and Platt attempt to exonerate Olinsky.

A ride along goes wrong; Burgess must make a difficult decision between following the advice of Voight, or a potential new ally.

While Ruzek goes undercover, he finds out that his father works for a suspected dealer, which forces him to figure out if his dad is involved.

An alderman's wife is bludgeoned to death; in efforts to elicit a confession, Upton reveals a dark story that pertains to her childhood.

The Intelligence unit suspects that a local mosque leader may have a role in the bombing of an Army recruitment station; a second explosion transpires.

Atwater faces a difficult decision between doing what's necessary to solve a young dealer's murder and doing what's best for the community.

Antonio oversteps a boundary that puts the entire crew in danger.

The Firehouse 51 team reacts to the arrival of a new fire truck; Boden and Severide are asked to reconcile with an old enemy; Brett learns some family news.

A string of mysterious gas leaks puzzles Firehouse 51; Brett develops conflicted feelings when her birth mother is eager to search for her.

A string of teen opioid overdoses leads Severide to join Sean Roman, but he suspects that his old friend isn't telling him the entire story.

Boden becomes tense after he begins a new fad diet; Casey and Severide fail to agree on a call; Brett's birth mother shares some big news.

Things get personal for Casey and Gallo following a suburban house fire that involves a mother and her young son; Herrmann works more respect.

Lt. Severide joins Seager and the OFI when suspicions surface about a motel structure fire; Brett continues become invested in her birth mother.

Problems ensue when a former basketball coach is sentenced to serve as a coach for basketball players with disabilities per the court.

Investigators examine the case of a young pregnant mother who vanished in Virginia.

After a nurse and mother-of-three is murdered inside her Illinois home, investigators uncover security camera footage that could be key to solving the case.

Detectives attempt to determine if two cases are connected after a victim disappears a year after another victim vanished in a neighboring town.

Detectives attempt to determine if two cases are connected after a victim disappears a year after another victim vanished in a neighboring town.