Chicago PD, Season 6

Bad heroin is causing overdoses in Chicago, and Intelligence is a man down with Voight (Jason Beghe) suspended. Antonio (Jon Seda) takes charge, but Ruzek (Patrick John Flueger) undermines his authority.

After discovering the true cause of the high rise fire, Intelligence races to find the man responsible. And for Halstead (Jesse Lee Soffer), it's personal.

Politics get in the way as the team tries to rescue a teenage girl kidnapped by a robbery crew. Voight (Jason Beghe) and Platt (Amy Morton) try to exonerate Olinsky.

A ride along goes sideways, and Burgess (Marina Squerciati) is faced with a difficult choice: follow the advice of Voight (Jason Beghe), or a potential new ally.

While undercover, Ruzek (Patrick John Flueger) discovers his father (guest star Jack Coleman) is working for a suspected drug dealer and is forced to ask the question: is his dad involved?

The wife of an alderman is beaten to death, and Voight (Jason Beghe) is under pressure from First Deputy Superintendent Brennan (guest star Anne Heche) to close the case. To elicit a confession, Upton (Tracy Spiridakos) tells a dark story about her childhood.

Intelligence suspects the leader of a local mosque is behind the bombing of an Army recruitment station. After a second explosion, Voight (Jason Beghe) urges Halstead (Jesse Lee Soffer) to follow the facts and not let his time in the service cloud his judgment.

While CPD tries to take down a drug kingpin, Atwater (LaRoyce Hawkins) faces a tough choice between doing what's required to solve the murder of a young dealer and what's best for the community.

In an attempt to dig himself out of a hole and save someone close to him, Antonio (Jon Seda) crosses a line that puts the entire team at risk.

Voight and Ruzek lock horns over how to handle the aftermath of the Antonio situation. Meanwhile, a series of violent carjackings turns deadly, and Ruzek must rely on a C.I. he grew up with to help solve the case.

When a defense attorney is murdered after a fundraiser, Intelligence must confront the world of campaign finance, which makes them reconsider their decision to back the current pro police mayoral candidate.

While chasing a heroin supplier, CPD crosses paths with a convicted criminal recently released on a technicality. Halstead's (Jesse Lee Soffer) history with the man threatens the team's ability to put him back in prison.

Atwater (LaRoyce Hawkins) goes undercover to bring down the longtime head of a criminal enterprise and becomes entangled in a situation that tests his allegiances as well as his conscience.

The team travels to a Wisconsin gun show to take down a supplier who's manufacturing "cop killer" machine guns. Before going undercover together, Burgess (Marina Squerciati) discovers that Upton (Tracy Spiridakos) is dating Ruzek (Patrick John Flueger).

Second part of a crossover with "Chicago Fire": Using information from Chicago Fire's Cruz, Intelligence chases down the robbery crew that's been using the lockbox key. Voight (Jason Beghe) is under pressure to bring the crew to justice without tarnishing the reputation of a murdered firefighter who might have been involved.

Voight's (Jason Beghe) "stay out of politics" stance is challenged as Intelligence uncovers the details surrounding a prolific serial killer.

A mayoral candidate is shot by an unidentified sniper, and CPD races to catch the shooter before he can take out his next target.

With the threat of a gang war looming, Voight (Jason Beghe) and Ray Price (guest star Wendell Pierce) must organize a peace summit to end the bloodshed before more innocent people get hurt. Burgess (Marina Squerciati) evaluates her future with Blair (guest star Charles Michael Davis).

Intelligence's investigation into the murder of Burgess's (Marina Squerciati) boyfriend threatens to reveal a dark side she was unaware of. But the real motivation for his murder uncovers a much more unsettling truth.

A violent crew is hitting pharmaceutical delivery trucks and stealing drugs, but their motivation is more complicated than just money. The case tests Upton (Tracy Spiridakos) and Ruzek's (Patrick John Flueger) relationship.

Antonio (Jon Seda) struggles with his guilty conscience as he tries to take down a major drug dealer. In order to protect his team, Voight (Jason Beghe) takes a big shot at Kelton (guest star John C. McGinley).

With Kelton's (guest star John C. McGinley) election all but assured, Voight (Jason Beghe) and his team must go off book in a last ditch effort to save Intelligence from getting axed.

Take a look back at the life and friends of Detective Alvin Olinsky.