S4 E1 • Fire (1)

Bolander and Felton are suspended for 22 weeks without pay for incidents related to activities at a police convention in Washington, DC. Howard plans to take the sergeant's exam. Pembleton and Bayliss are assigned to investigate the death of a body found at an arson. At the scene they meet an arson detective that clashes with Frank's working style. Frank hesitates chasing a suspect, and later we learn that his wife is pregnant. Munch also decides to take the exam, and when the wagering begins on who is going to pass, everyone favors Howard. While the detectives are debating whether the fire was set to cover the murder, another fire is started.

Première diffusion : 20 octobre 1995

S4 E2 • Fire (2)

The fire investigation continues. Bayliss' back is acting up and Kellerman is paired with Pembleton. Kellerman shows Gee something, so he is offered a transfer into the department that he first rejects. Kay takes the sergeant's exam, Munch misses it due a ""comedy of errors.""

Première diffusion : 27 octobre 1995

S4 E3 • Autofocus

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Première diffusion : 3 novembre 1995

S4 E4 • Thrill of the Kill

The squad returns to the station. The FBI joins with the detectives to stop a ""thrill killer"" who's working his way north on I-95. Gee tries to reconcile with his daughter. The killer smells a rat at a roadblock so he bails out of his pickup. Everyone mobilizes to find him and when they do, the suspect in custody, while identical to the killer, claims he is innocent.

Première diffusion : 10 novembre 1995

S4 E5 • Hate Crimes

Pembleton and Bayliss investigate a murder that was committed in a gay neighborhood by skinheads and the victim's sexual preference is questioned. Brodie is hired by the department to videotape the detectives' crime scenes. A voice stress analyzer is brought in for a demonstration. Meldrick gets a lead and closes an old Crosetti case that even Howard couldn't crack; it causes a little tension between them.

Première diffusion : 17 novembre 1995

S4 E6 • A Doll's Eyes

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Première diffusion : 1 décembre 1995

S4 E7 • Heartbeat

Lewis and Kellerman interview a suspect and uncover a 10-year-old crime, which is assigned to Howard and Munch. Tim lets Frank's secret about Mary's pregnancy slip out. Howard and Munch find the body from the 10-year-old murder bricked up in a wall. John has a date with Alyssa, the ME, but finds himself in bed with her new roommate before their date, so he begins avoiding her. Howard and Munch's murder suspect has a fascination for former Baltimore resident Edgar Allan Poe. Munch plays up that angle while trying to break their suspect.

Première diffusion : 8 décembre 1995

S4 E8 • Sniper (1)

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Première diffusion : 5 janvier 1996

S4 E9 • Sniper (2)

The sniper continues the shootings and everyone returns to duty lacking sleep. The media starts to make their presence felt. Munch begins to worry about Howard's safety, fearing she'll be wounded again. Frank makes his wife wear a bulletproof vest. Gee asks for Russert's help even though Barnfather had ordered her to stand down during the rest of this investigation. A man at the scene of both of the day's shootings is put into the box for questioning. Russert has a talk with the suspect with the subject being keeping people's attention and respect.

Première diffusion : 12 janvier 1996

S4 E10 • The Hat

Gee is sent upstairs to see Barnfather and everyone speculates about the vacant Captain's position. Lewis and Kellerman are sent to Pennsylvania to extradite a woman back to Baltimore where she is a suspect in the murder of her husband. Munch tries to find a videotape in Brodie's pile. Later after reviewing the tape, they discover a key piece of evidence isn't contained on the tape. Munch wants the tape erased, but Brodie delivers the tape to court and that results in the outcome Munch feared. On the trip back from Harrisburg, Kellerman convinces Lewis that they have time to stop at Neptune's Castle and they lose the suspect, for a moment. Later they lose her again but find her at the house of her dead husband's mistress, delivering a hat. Much to everyone's surprise but not the viewers Gaffney is promoted to Captain over Gee. Captain Gaffney lays down the law.

Première diffusion : 19 janvier 1996

S4 E11 • I've Got a Secret

Lewis and Kellerman try to subdue a large man who's gone on a rampage. The large man is finally subdued and they find him digging up his mother. This case brings out some information about Meldrick's family, and he tries to see his brother, who doesn't want to see him. Kay tries to keep the identity of her new boyfriend a secret, mainly from John, which drives him crazy. Pembleton and Bayliss investigate the death of a man whose body is found in a car. Scheiner says he died from internal bleeding, not the gunshot wound to the groin he was treated for at an emergency room earlier that day. They discover that the doctor may have had a motive for doing a less than adequate job treating her patient.

Première diffusion : 2 février 1996

S4 E12 • For God and Country (2)

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Première diffusion : 9 février 1996

S4 E13 • Justice (1)

Russert and Munch are assigned to work a case together; they find a retired cop who was murdered near his wife's tombstone. The dead cop's son asks Lewis, whom he went to the academy with, to get involved with case. He also makes his own inquiries, which get him into a bit of trouble. A suspect is arrested; however, despite the overwhelming evidence against the accused, the jury acquits him. The son contemplates delivering his own justice.

Première diffusion : 16 février 1996

S4 E14 • Justice (2)

Jake Rodzinski has trouble dealing with the verdict of the trial and takes justice into his own hands. Kellerman is back from a family wedding in Wisconsin picks up the case of the murder of Kenny Damon. Lewis is not allowed to know all the details of Kellerman's investigation, because of his past relationship with Rodzinski, their chief suspect. Bayliss is at odds with Pembleton over the disposition of a grilled cheese sandwich.

Première diffusion : 23 février 1996

S4 E15 • Stakeout

The entire squad is put on 24-hour surveillance when a mass murderer has been identified, isn't at home and doesn't know that they know. Gee debates leaving the squad in the midst of the stakeout, so he can attend his daughter's wedding in California. As the detectives rotate through shifts on the stakeout, the main topics of discussion are the homeowners and Bayliss' plans to leave the unit.

Première diffusion : 15 mars 1996

S4 E16 • Requiem for Adena

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Première diffusion : 29 mars 1996

S4 E17 • Full Moon

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Première diffusion : 5 avril 1996

S4 E18 • Scene of the Crime

Lewis and Kellerman's investigation of a murder in a housing project puts them at odds with a civilian-patrol group, run by the Black Muslims. Munch is excited because Stan is scheduled to come back June 1st. Russert and Munch catch a case where both the victim and shooter are dead. She with Howard must decide whether to circumvent the so-called ""blue wall of silence"" among police officers when it is discovered that the officer on the scene didn't react in time. Barnfather stops Lewis and Kellerman's charging of a Muslim, until something is leaked to the newspapers. The ""big man"" is scheduled to come to the bar, but changes his mind, twice.

Première diffusion : 12 avril 1996

S4 E19 • Map of the Heart

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Première diffusion : 26 avril 1996

S4 E20 • The Damage Done

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Première diffusion : 3 mai 1996

S4 E21 • The Wedding

A trash-talking radio talk-show host makes a proposal to his listening audience. Lewis announces to Kellerman that he is getting married today, then he throws up. He motivates the rest of the squad to help him with the final details as he is getting married ""tonight after the shift ends."" Kay brings her sister with her to the station. Since the whole squad is busy with Lewis' wedding, Gee takes Howard out to work the homicide of the radio talk-show host. One of his listeners took him up on his proposal. Munch is skeptical about the Lewis wedding; he thinks it's an elaborate practical joke. Bayliss and Kellerman vie for the attention of Kay's sister. Gee shoots and kills a potential suspect, but the suspect was in jail at the time of the talk show host's murder. The guy who fingered him admits that he did it as a joke. The wedding is no hoax. During the festivities Pembleton's wife goes into labor.

Première diffusion : 10 mai 1996

S4 E22 • Work Related

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Première diffusion : 17 mai 1996