Kelly testifies in the Licalsi case. Sipowicz warns a battered wife to separate from her husband or face further abuse. The detectives form a stake out when several drug dealers are beaten and robbed.

The jury reaches a verdict in the Licalsi case. Internal Affairs continues its investigation of the missing pages from Marino’s ledger. Kelly and Sipowicz suspect that a man trying to go straight may have committed a double homicide.

Kelly is paired with an Asian detective and assigned to investigate the murder of an off-duty officer in Chinatown. Sipowicz is outraged when an abused wife is found dead. Detective Lesniak is transferred to the precinct after her relationship with another officer sours.

Kelly says his final good-byes before leaving the station house. The detectives investigate a shooting incident that took the life of a baby girl. Sipowicz secretly relocates the corpse of a fellow detective who died while making love to a prostitute in a seedy motel. Internal Affairs concludes its investigation of Kelly’s history with the NYPD.

Kelly’s replacement, Detective Bobby Simone, begins his first day at the precinct. The detectives search for clues when a mobster’s son is killed outside his girlfriend’s apartment. Abruzzo threatens Lesniak with a gun. A mother accuses her husband of sexually molesting their fourteen-year-old daughter.

The detectives investigate the death of a chiropractor’s wife. Roberts hires Martinez to work for his security business. Simone aids a young boy whose mother discovered he possessed a gun.

An eleven-year-old boy takes the blame for killing another youngster with a gun. A man who may have knowingly infected several girlfriends with the H.I.V. virus becomes a moving target. Donna’s flirtatious sister makes a pass at Medavoy. Sipowicz is heartbroken when all of his fish die.

The detectives discover the charred remains of a pregnant woman in a vacant field. Dan Breen is attacked by his mentally disturbed son. A man who planned a pawn shop robbery claims his former cell mate committed the crime.

The detectives investigate a murder at a gay bar. Medavoy goes undercover at a gypsy parlor. Dan Breen reestablishes his relationship with his mentally-ill son.

Simone’s pursuit of a serial killer puts him at odds with the Task Force. Fancy receives a tip regarding the heist of an armored car. A man exposes himself in front of Lesniak.

Simone gets a break in the Webster’s case. The detectives move in on the armored car robbers. A woman is blackmailed by a fellow employee. Vinnie Greco cooperates with Fancy’s plan to expose Haverill.

Simone and Sipowicz’s case against a vicious killer is jeopardized by Clifford Bass, the new, inexperienced Commander. Lesniak and Medavoy target a con artist whose victims are lonely single women. Simone warns a childhood friend to distance himself from some shady characters.

Simone and Sipowicz drive to a small upstate town where they question a suspect about a triple homicide and robbery. Lesniak and Medavoy search for a man accused of raping an elderly woman.

A police officer is suspected of shooting a pimp. Donna accuses Medavoy of spying on her.

Bobby and Andy collide with a Romanian immigrant who has a woman locked in the trunk of his car. Later investigation shows him to be a terrorist. While transporting the serial killer out of the station house, the Webster serial killer is shot and his last victim's father is on the premises. Bobby begins to investigate the father and another member of a victim's support group. Greg tries to talk with Dana about his relationship with Donna, but she takes advantage of the situation. James asks Adrianne out for dinner; however, she rejects him because she does not want to be involved in relationship with someone she works with, given her previous history.

Simone and Sipowicz investigate the murder of a Puerto Rican teen because he used to make some paintings in Little Italy. Greg meets Donna's former lover and she makes a decision about her relationship with him. Sylvia is mugged and later tells Andy a secret from her past.

Bobby's emotionally fragile witness for a double-murder keeps changing her story, she is really only interested in him. A family run business, that Andy used to work in, is held up and the owner's wife is killed, he participates in the investigation that involves some of his old friends. Donna's temporary replacement is gay. James enters in a department boxing tournament.

The detective's search for a killer following a shooting spree, where a rookie cop's missed shot also kills a bystander. Fancy's brother, a cop in the 8th precinct has racial troubles with his commanding officer and Arthur intercedes on his behalf and his own boss covers for him during their crisis. Andy goes to the doctor and finds out that he has an enlarged prostate, Sylvia thought their lack of sexual activity was because of the incident from her past that she had told Andy about. When Andy and Bobby go back to the apartment where the shooter lived, they discover he has returned, resulting in Bobby saving Andy's life.

Fancy works with James to help him get ready for the boxing tournament. Simone is attracted to an undercover cop that works with him on an arson sting. A woman that Sipowicz gets to testify in a case is murdered by the men she was going to testify against.

The detectives search for the killer of a bookie. Donna returns ready to resume her position. Bobby's head case witness tries to end his career when he won't give her what she wants. John gives all of the detectives’ farewell greeting cards; later, Fancy proposes that he move upstairs to anti-crime where there is an opportunity. Andy and Sylvia meet with the priest and later Sylvia hears a story about what has contributed to Andy's loss of faith. Andy smells something familiar on Russell.

A witness smells alcohol on Russell's breath. Officers in another precinct bash John and his lover, so he asks Bobby for some help. A terminally ill infant helps the detectives locate a serial rapist. Bobby confronts Russell about her drinking. Greg meets with his wife who would like them to get back together for the kids and Donna tells him where their relationship stands. When Kelly can't get back for the wedding, Andy asks Bobby to be his best man.

Two years ago he called her a "pissy little bitch," tomorrow he will call her "Mrs. Sipowicz." Pre-wedding jitters put Andy in rare form. Russell's problem makes her miss getting a gun off a suspect and Bobby isn't happy about it; later she admits to having a problem. Fancy's brother is still having trouble with his sergeant and is being investigated by the IAB. Bobby and the squad work to help clear his name. James goes out with Adrianne. Greg brings his wife to the wedding. Andy Jr. makes it to the ceremony.