Season 18, Episode 18
Season 18 ends with the murder of a jeweler. The investigation leads detectives to a prostitution ring run by the victim's brother-in-law. The resulting trial proves to be a challenge for McCoy, whose career is threatened because of the probe. Tom Everett Scott guest stars.
The probe into an auto mechanic's murder leads detectives to the man's boss, whose online affair with a young girl was exposed by the victim.
Season 18, Episode 16
Connie is ordered to defend a man accused of killing a worker participating in a legal-aid strike. Because of the number of attorneys on the picket line, Connie is pitted against Cutter at the trial.
Season 18, Episode 15
A writer's death appears to be a suicide, but Lupo and Bernard suspect a cult is involved, which causes trouble for Cutter at the trial when jurors fear for their safety.
Season 18, Episode 14
Det. Green becomes the subject of an internal investigation, led by Det. Kevin Bernard (new series regular Anthony Anderson), after he is implicated in the shooting of a well-known hustler.
Season 18, Episode 13
The violent slaying of an art dealer initially appears to have connections to a terrorist organization. But the probe leads the detectives to the victim's troubled son and his ties to a fanatic religious group.
Season 18, Episode 12
The detectives connect a woman's brutal slaying to a dogfighting ring and a wealthy wine dealer. Lara Flynn Boyle guest stars as a resourceful reporter tracking the case.
Season 18, Episode 11
A psychiatrist who counseled troubled teens is murdered, and the probe reveals he was intimately involved with his underage patients. This leads the detectives to suspect the man's wife (Moira Kelly), whom he met when she was a patient.
Season 18, Episode 10
Clues in the murder of a high-school girl point to a prostitute (Maria Dizzia) and her partner, and a war of words ensues as each accuses the other of the crime. Later, Connie deals with a staunch admirer in the jury pool.
A doctor attending a convention is murdered in his hotel room, and detectives discover he made a large cash withdrawal shortly before his death. Upon further investigation, Lupo and Green begin to suspect the man was not the killer's intended target, and another physician may still be in danger. Alan Zweibel, James Rebhorn.
Season 18, Episode 8
A peaceful protester at an immigration rally is killed, and evidence indicates the police are to blame. The case becomes a political nightmare for McCoy, who refuses to back down and is accused of pushing his own liberal agenda.
Season 18, Episode 7
Evidence in a hit and run leads to a real-estate scam artist who has all but vanished. With the help of a title-agency employee (January Jones), the detectives go undercover in an attempt to lure the conman out of hiding. But the sting goes bad, prompting the department to shift its focus to a surprising suspect.
The triple homicide of three roommates ostensibly appears to be a murder-suicide, the grim result of a lovers' quarrel. But after closer inspection, the case begins to swirl around a politically connected con man.
Season 18, Episode 5
Lupo and Green investigate the murders of a white teen boy and a black girl in a delicate, racially charged case that soon envelops two brothers (Jeremy Allen White, Miles Chandler) and a local boy's father (Kevin Carroll).
Season 18, Episode 4
A lawsuit over missing pants becomes a murder case when the defense lawyer is killed. The investigation takes an unexpected turn when Detectives Green and Lupo uncover a connection to a large retail corporation that employs Van Buren's old friend and mentor, but the man's eagerness to help begins to cross the line and threaten the case.
An explosion alerts Lupo and Green to a scientist's controversial research after one of the test subjects, a pregnant woman, is injured.
Season 18, Episode 2
Detectives are called to an executive's home during a blackout and discover a murder and kidnapping. Fall Out Boy's lead singer Patrick Stump guest stars.
Det. Lupo's return is marred by his seriously ill brother's suicide by lethal injection. A second death with identical circumstances leads Lupo and Green to a parolee nicknamed "Dr. Death" and his daughter (Marin Ireland), who may be following in her father's footsteps.