Detective John Kelly has his hands full. On the work front, his partner's drinking problem and continual harassment of gangster Alfonse Giardella is about to get them both in over their heads with the mob. On the personal front, his wife wants a divorce.

Lieutenant Fancy and Detective Kelly are warned to stop pressuring the mob even as Andy Sipowicz lies in the hospital with numerous gunshot wounds. Back at Kelly's ex-wife's apartment building, an angry young man starts carrying a gun for protection.

After discovering the hotel where Giardella is being held, Sipowicz gets his revenge with the help of a pet bulldog and the hotel's thankful chef.

Kelly quits moonlighting as a bodyguard after discovering his millionaire employer is a wife beater. Later Kelly speaks at a tenant meeting explaining the dangers of carrying a gun for protection. Unfortunately, his talk has little impact on the tenant in 4B.

Martinez discovers the superintendent of his brother's apartment building is a cop who beats and robs tenants who fall behind on their rent.

Kelly is forced to arrest a close friend after a fight on the basketball court leaves another friend dead.

When Sipowicz's estranged son, Andy Jr., shows up and announces his engagement, Andy Sr. decides to look into the bride-to-be's background.

Lieutenant Fancy hires Donna Abandando, a well-endowed civilian employee, to work in the precinct's "safe street" program.

When Martinez's brother dies from a drug overdose, their father sets out to kill the drug dealer responsible.

Ignoring Kelly's advice, Licalsi reveals that she's being blackmailed by the mob. Kelly and Sipowicz investigate the brutal robbery-murder of a wealthy family and work with a pawn dealer in hopes of retrieving a stolen Oscar statuette.

As the holiday's approach, Kelly and Sipowicz get a early gift in the form of a hot tip while investigating the kidnapping of a young girl.

While Martinez investigates a series of robberies involving a fake ATM machine, Kelly's current case yields evidence that links Licalsi to the mob. Meanwhile, Lt. Fancy tries to extend his custody of a young boy whose mother is in a drug rehabilitation program.

Donna's joy over Medavoy leaving his wife is short-lived when he has a change of heart.

When a woman who was raped refuses to press charges for fear her husband will say she brought it upon herself, Licalsi acts as a decoy in an attempt to trap the prime suspect.

When Kelly and Sipowicz respond to a suicide call they find the body of a police informant who had come to the precinct earlier that day shouting that she was sleeping with her police contact. Licalsi suspects that her partner is taking drugs.

Sipowicz has to diffuse an explosive situation when a disabled Vietnam vet who was mugged decides to take matters into his own hands.

Sipowicz is furious when he suspects a private investigator is giving false hope to a man whose daughter has been missing for 2 and a half years.

When a material witness to a drug hit turns up dead, Sipowicz and Kelly's investigation leads them to two brothers who have also planned a hit on Kelly's ex-wife, Laura. Sipowicz must perform uniform-detail in a dress uniform way too small.

Detectives searching a landfill for the body of a dead girl find the body of a millionaire instead. While Kelly interviews the wife of the deceased, Sipowicz does some investigating of his own after Andy Jr. is arrested for selling cocaine.

Kelly and Sipowicz investigate the death of a man's mistress, which they later find out is one of many lovers the man currently has. Meanwhile, Licalsi is promoted and Fancy breaks the news to her husband that she's pregnant.

Even as Licalsi confesses to shooting Angelo Marino and his driver, Martinez is forced to shoot an irate man who points a gun at Medavoy while they're stuck in traffic.

Sipowicz and Kelly investigate the stabbing death of a priest whose body was found in a park frequented by male prostitutes.

Licalsi tries to plea bargain his case and only get six years in prison for the murder, but Kelly is greatly opposed to the bargain after realizing he's in love with Janice. After learning that Kelly still has feelings for Janice, Robin ends their relationship. Meanwhile, Sipowicz and Kelly go on a stakeout of an apartment complex that have been the target of several robberies.

Licalsi takes the stand during her trial. The Internal Affairs Bureau investigates Kelly and Sipowicz in regards to the arrest of Officer Guyce and Officer Quint. Meanwhile, Kelly, Sipowicz, Medavoy and Martinez investigate the murder of a black couple.

Kelly investigates the death of an undercover cop in Chinatown, and to do so he must accept help from a prominent Chinese gang leader. Meanwhile, Sipowicz finds out that a former abuse case he had worked on has escalated into homicide; and Medavoy and Donna’s relationship is revealed after Lt. Fancy catches them in the act, leading to Fancy warning the precinct against interoffice relationships.

Kelly’s future with the force is decided as he investigates the death of an 18-month old baby shot in a drive-by while riding in a car driven by Duane Rollins. Though everyone believes the act was random, Kelly believes that Rollins was the intended target. Meanwhile, Sipowicz finds the body of a cop, and must continue dealing with both his commitments to Alcoholics Anonymous and his feelings for Sylvia Costas.

In Kelly’s absence, Detective Bobby Simone joins the force and is assigned to work with Sipowicz on a case involving the murder of a mob member’s son. Later at the precinct, her boyfriend, Detective Jimmy Abruzzo, threatens Detective Lesniak with a gun; and a woman claims her husband is sexually abusing her 14-year old daughter.

A chiropractor’s wife is found murdered and Simone and Sipowicz discover that the chiropractor, Dr. Peter Shennon, was having an affair with his secretary, Judith Krasky, which turns all suspicions towards him. Meanwhile, while working for a security company, Martinez falls for Leticia Beltran, a college student he’s assigned to protect. Later, a woman, Christine Williamson, brings Simone a gun she found her 11-year old son playing with.

An 11-year old boy admits to killing an Hispanic student in the midst of a turf-war at his elementary school, but Simone has a suspicion that the boy is taking the fall for someone. When a ladies’ man, Eddie Reyna, learns he’s HIV positive, he becomes targeted by one of his former lovers that he infected with the disease. Meanwhile, Donna’s sister, Dana, comes to town for a visit, which causes a rift between Donna and Medavoy.

Sipowicz and Simone are assigned to the case of a pregnant woman who was murdered and the only charred remnants remain, which means there are few clues for the detectives to go by. Meanwhile, Sipowicz grows increasingly concerned when a close friend, Dan Breen, is badly beaten by his mentally handicapped son, Danny.

Simone and Sipowicz investigate the murder of a gay bar proprietor and have transsexual Candace La Rue as a material witness. Dan Breen decides to visit his mentally disturbed son, Danny, despite Sipowicz warning him not to do so. Elsewhere, Medavoy investigates a fortune telling scam after a woman is conned out of her life savings; and Lt. Fancy’s wife goes into labor.

Detective Soloman tries to use his status to steal a case from Detective Simone after Simone arrested a notorious serial killer, Putnam. Meanwhile, Commander Haverill tricks Lt. Fancy into lying about a case involving a crime lord; Lesniak goes after a flasher; Sipowicz once again proposes to Sylvia Costas; and Benita Alden, a reporter, flirts with Simone.

Simone and Sipowicz follow hot on the trail of the “Webster Dictionary” serial killer, though bureau politics take their toll on the case. Meanwhile, Sipowicz uses Vinnie Greco as an informant in order to try to stop a bank heist; and Lt. Fancy enlists Greco’s help in order to get even with Commander Haverill.

The detectives investigate the brutal murder of a young woman. Their investigation leads to one main suspect – Derrick Cobb, the girl’s former stepfather. Simone worries that one of his close friends, Raymond diSalvo, has gotten involved in drug dealing at a dance club. Lesniak investigates con artist Mac McClellan.

Three fast-food employees are murdered execution-style. As Simone and Sipowicz investigate the murders, Martinez and Lesniak look into the attempted rape of an elderly woman. Meanwhile, Sipowicz and Sylvia Costas have differences when it comes to planning their wedding; and Martinez becomes jealous when Lesniak has lunch with an old friend, Dr. Druzinski.

Simone and Sipowicz investigate the death of a pimp, but all evidence they find points to one of their own, Jerry McCabe. Medavoy’s constant jealously causes Donna to rethink their relationship and Simone begins to worry that Benita Alden is using him for her career gains.

Simone and Sipowicz are assigned to investigate Vartan Illiescu, an immigrant suspected of being a terrorist. An unknown person kills George Putnam, a serial killer, out of revenge before he can be tried in court. Meanwhile, Medavoy and Donna’s relationship crumbles after Medavoy gets advice from Dana.

Simone and Sipowicz are put on the case of a teenager known for his graffiti work who was brutally murdered. Meanwhile, Donna continues to contemplate her relationship Medavoy; and Sylvia is mugged, which results in a deep secret being revealed to Sipowicz.

Simone has to convince Joyce Novak, a witness in a double-homicide case, to testify. Sipowicz is assigned to investigate the murder of an elderly woman who was the owner of a candy store he worked at when he was growing up.

A man goes on a shooting spree, killing a waitress, two cops and three other citizens before he was apprehended. Meanwhile, Lt. Fancy speaks on behalf of Reggie after Reggie squares off with Sgt. MacNamara.

Simone becomes attracted to an undercover cop, Diane Russell, as they work together to capture an arsonist. Sipowicz becomes personally involved in a case after a woman he convinced to testify in a case is murdered. Martinez and Lt. Fancy square off at the annual department boxing tournament.

Help comes from an unexpected place as Sipowicz and Simone investigate the murder of a bookie. Joyce Novak, a witness to a murder, charges Simone with sexual harassment. Meanwhile, Sylvia and Sipowicz head to religious counseling to prepare for their upcoming nuptials.

An ill infant becomes the missing link in a serial rapist case Simone and Sipowicz are investigating. Simone suspects Russell of trying to cover up a serious problem; Medavoy considers getting back together with his wife with whom he is separated; and Irvin asks Simone for help when police officers assault him and his lover.

Sipowicz tries to get a confession and capitalizes on a mistaken identity. Lt. Fancy’s brother is falsely accused of accepting bribes and Simone is able to uncover the truth behind the crime. Russell’s apparent hangover almost results in a hazardous situation during a sweep. Later, the precinct throws a bachelor party for Sipowicz, who is noticeably dealing with pre-marriage jitters.

Martinez is shot when he and Medavoy walk in on a bar robbery. One of the robbers gets protection from the DA for information, which upsets James' colleagues. Sylvia breaks some news to Sipowicz, while Simone and Russell try for a reconcilliation.

An ill man is accused of killing his sister, but Simone suspects otherwise. Meanwhile, Medavoy and Sipowicz go under cover to recover a stolen Jewish icon. Sipowicz struggles to keep a secret.

Simone and Sipowicz get a break in a rape case when a man fitting the assailants description is seen in the station. Russell has to resolve her families domestic problems. Meanwhile, Martinez, on his first day back, gets some disappointing news from Lesniak.

A baby and a small child are shot and killed in a robbery. Sipowicz's bad mood hinders the investigation and causes a rift with Simone.

Ronnie Drucker, a detective under investigation, is reassigned to the 15th squad and compromises Simone. A young girl, confused by drugs, is the only witness to a shooting in a laundromat.

Simone and Sipowicz investigate the murder of an Indian woman, found strangled in her locked car. Medavoy and Martinez arrest a man acting strangely and find he's involved in a credit card scam. Lesniak and Russell team up to trap a gun dealer. Simone gets over-protective and makes Russell angry.

An ex-boxer, an old friend of Simone's, refuses to admit he's getting forgetful. The FBI take over a kidnap case, but Simone and Sipowicz find an informant and work the case on their own.

Simone's old pal Ray turns informant, from jail, in order to get a reduced sentence, but things don't go to plan. A father takes deadly revenge to protect his bullied son. Medavoy has to placate 2 actors who come to blows on stage.

A young girl is found stabbed, in Chinatown. Suspicion falls on the ex-boyfriend. Simone & Sipowicz Investigate. Martinez & Lezniak have to investigate a robbery, together, despite the bad feeling between them. Medavoy moves into the bunk-room.

A basketball game, held in the memory of a young boy, erupts into violence. 2 dead, 7 wounded. Andy has a race relation's problem with the organizer of the event that was witnessed by a reporter. Fancy and Sipowicz's relationship is on shaky ground as details of this event come to light and Andy is removed from the case.

A girl's body is found, burned, in an abandoned basement. Information from the husband of the girl's best friend points to a Russian, who had tried to date her, but had been refused. Simone puts together a scenario, involving the husband and 2 of his associates. Medavoy gets some overtime, on bodyguard duty and gets lucky in the card school.

A bruised and battered wife tells Sipowicz that her husband claimed to have killed somebody 8 years previously. Sipowicz follows a trail, leading back to 2 previous relationships. Russell is told that her father has been shot and killed. Her brother claims to have done it, but Simone thinks he's not telling the whole truth.

Russell gets a lawyer for her mother. Simone and Sipowicz investigate the shooting of a known mobster's son. Suspicion falls on his younger brother, but the father interferes with the search. Medavoy and Russell get a call to where a woman has been shot, while in bed. Her son tells Russell that he got a message, from his step-father, confessing to the shooting. His rich step-father's lawyer makes difficulties.

Martinez and Lezniak's relationship takes a step forward. Simone and Sipowicz are called to a bloody murder scene with satanistic overtones. A doctor is mugged and shot on a visit to his secretary's apartment. Russell and Medavoy feel the wrath of his wife's anger.

A University Professor is found decapitated. His mother gives Simone and Sipowicz a hard time. Lezniak gets jealous when Martinez meets a porn star. Andy's son turns up, out of the blue.

After a young girl is strangled and thrown from a roof, Simone and Sipowicz find a similar case in another district. The investigating officer comes to the 15th, to share information and immediately gets in Andy's bad books. Russell and Martinez disagree over the claims of rape made by a woman, against a married schoolteacher. Sipowicz and Andy Junior go 'on the street'.

Medavoy and Martinez investigate the murder of a voodoo priest. Russell gets assigned to help a drug enforcement team, working in the Precinct. Simone spots an old acquaintance, Hollie, who used to give him good information.

A dead man is found, dumped in an alley. His name has possible mob connections. Donna gives Russell information about a possible hi-jack. A surveillance op goes wrong, when Simone and Sipowicz assist the FBI.

A woman is found, murdered, in her apartment. Neighbours fingers point at the junkie nephew. Simone and Sipowicz investigate. Medavoy and Martinez search for a biker, seen in a bar, where the bouncer is beaten to death. Sylvia nears the end of her pregnancy.

After a shooting at a bar, Simone and Sipowicz are sent to the hospital and find that they know one of the victims. The whole squad is involved in the hunt for the killers.

The hunt for AJ's killers continues.

Simone and Sipowicz go to a shooting at a paint shop. A suspect is located in hospital, with a bullet wound. The other detectives go to a shooting in an alley, where the victim has bullet holes, but no sign og blood.