Richardson confronts Sipowicz and Simone about their impending questioning of his wife over the murder of the nurse, but with the exception that Richardson is a real bad person, Sipowicz and Simone reach nothing. In a cross-over from the series "Upstairs", former temp and private detective John Irvin stops by the station to tell the detectives about the new graphics art business he started. But with the exception of the receptionist Dolores, no one is around, including Medavoy who leaves in a hurry for upstate New York where Abby now lives to be by her side when she goes into labor. Meanwhile, Kirkendall and Russell look into the theft of a graduate film student's camera, where only the student seems more interested in dispensing his own justice. Also, Sylvia finally learns about Sipowicz's medical condition from his doctor and finally persuades him to go for further tests and possible surgery.

The detectives get a break in a case involving a police officer suspected of committing murder.

Danny could be in big trouble for roughing up a suspect. Detective Connie McDowell joins the team for the day.

Andy witnesses a hold-up in the street and shoots at the get-away car. Det. McDowell is assigned to fill in at the squad again.

A man loses his penis. Fancy makes Captain and the incoming Lieutenant is a ball-breaker. Andy is having second thoughts about Cynthia. A mob hit-man sings like a canary and implicates a celebrated Customs officer.

A man caught carrying a cash register takes Andy and Danny to a body. Fancy is packing up to leave. His replacement alienates the squad before he's even left.

Rodriguez mediates when Sipowicz and Sorenson clash with detectives from another squad anxious to solve a multiple murder case; Medavoy and Jones try their hand at making extra cash by cleaning up murder scenes.

Sipowicz and Sorenson investigate a case involving an off-duty police officer who was shot in the company of a prostitute; Medavoy and Jones aid a hapless bodega owner by concocting a story to keep him out of jail.

Jones and Medavoy investigate the murder of a Chinese restaurant owner. An IRS lawyer claims to have been kidnapped and released, but Sipowicz and Sorenson doubt his story.

Sipowicz and Sorenson try to get one scared witness to identify a murder suspect, while Russell and McDowell guard another witness who's due to testify in a murder trial.

Sipowicz and Sorenson investigate the murder of an exotic dancer; Sipowicz and Medavoy act as elderly decoys to catch some street thieves attacking old people outside a local bank.

Sipowicz and Sorenson investigate the murder of a drug dealer, while Sorenson continues to see the stripper, Kristen, who draws him into a favor for the owners of the Tailfeathers club.

Sorenson is missing, and a stripper is found murdered in his apartment. Medavoy and Jones investigate a killing, but the suspect identified by an eyewitness has a seemingly unshakable alibi.

While investigating the murders of four teenage girls, the 15th squad discovers the shocking truth about the disappearance of detective Danny Sorenson.

Sipowicz is hailed a hero after killing the man responsible for Sorenson's murder. While Lieutenant Rodriguez teams up with another precinct to investigate the robbery of his mother, the squad investigates the murder of two men affiliated with NYU.

The squad investigates two homicides: the immolation of a would-be musician and the stabbing of a socialite. The newest detective to the squad, John Clark, Jr., attempts to both learn a new job and fit into the squad despite interference from his father.

The squad is joined by Eddie Gibson who's been transferred from nightwatch. McDowell and Gibson investigate the murder of a woman with MS, while the other detectives investigate the killing of a Rikers corrections officer.

When Clark's badge is stolen, the squad scrambles to find the thief before Clark must report the loss, which could ruin his career. McDowell and Gibson investigate a murder involving a young pregnant girl.

The squad investigates the theft of a baby from a hospital, and the arson of an Arab-owned business.

The squad investigates the murder of two drug dealers, and the discovery of a body mistakenly listed as a victim of the World Trade Center attack. McDowell arrests the daughter she gave up for adoption.

Sipowicz and Clark investigate the murder of a hispanic worker, while Medavoy and Jones search for a puppy-knapper who stole valuable champion bulldog pups. McDowell gets a new partner--Rita Ortiz.

Sipowicz and Clark are assigned to work with John Clark, Sr. on a murder investigation. Two good samaritans run afoul of the law when the burglar they caught dies from a head wound.

Sipowicz, Clark, Medavoy and Jones investigate a double homicide at a Latino restaurant. McDowell and Ortiz contend with a possibly mentally unstable woman who's posing as a cop.

The detectives investigate two separate murders of a college student and a Latina woman. Sipowicz goes after Mrs. Hornby's business manager. Haywood finally makes a decision about her pregnancy.

Sipowicz, Clark, Medavoy and Jones investigate the murder of an unassuming teenager. McDowell and Ortiz search for the person responsible for firing a stray bullet that killed a three-year-old girl.

The detectives investigate the separate murders of two supposedly upstanding citizens: an ex-convict turned community activist and a doctor who donated time to helping drug addicts and prostitutes.

The detectives work to solve two murders: the shooting of a rising rap star and the shooting of stripper found nailed to a table. McDowell and Sipowicz try to define their relationship.

The detectives investigate the bombing of an abortion clinic that killed a guard. The squad gets a new lead on an old murder case. Ortiz's husband, Don, is murdered by his mistress' husband.

The squad investigates the murder of a young Chinese girl along with an alleged rape case. Irvin learns his father is dying. Clark tries to find a foster home for James Kilik.

The squad investigates two homicides: a gay man who hit his head after being punched out and another man shot on the street. Rodriguez is set-up by iab to take a bribe from an old friend.

The day's cases include an armored car robbery that left one guard dead, and the homicide of a woman whose body was found in a garbage truck; Sipowicz intervenes in the iab's case against Rodriguez.

The detectives investigate two crimes: the murder of a back-alley cosmetic surgeon and a violent rape; Clark finally takes Laughlin on in the boxing ring.

Sipowicz is taken hostage in an interrogation room by a suspect in the murder of a pot dealer and two of her friends; a suburban mom found with drugs in her purse appears to be covering for her son.

An unreliable witness and an overzealous detective hinder a murder investigation; a con artist scam leads the squad to a sex-slavery operation; McDowell agrees to join Sipowicz and Theo at a theme park.

Andy and Connie return from their week's holiday with Theo. A boy goes missing, and the squad is lead to a pedophile in the area. John meets with a lawyer about his father's estate.

McDowell and Ortiz investigate the death of a woman found in her apartment, where an ex-con neighbor is suspect. The investigation into Scott's murder points towards his friend. Andy thinks about the future. Rita meets John's father.

The temperature is rising. Sipowicz receives a death threat. A prostitute is murdered, causing IA to look at Clark. A huge drugs and cash hoard is found. An elderly woman is found tied up and beaten.

A bomb threat is received at the courthouse. John Clark is placed on restricted duties pending charges for murder of the prostitute. John Irvin buys a new car only to be carjacked on the first drive.

Andy and John attend a shooting where a man is shot in the groin. Connie's sister turns up, pregnant and beaten by her husband.

A little girl disappears at the park, after her father leaves her - or so he thinks - in the care of a friend's nanny for a moment. Connie's brother-in-law is arrested.

A boy on a bicycle is murdered. Connie's sister posts bail for her husband.

Maya's partner in anti-crime is killed. A little girl is snatched off the street. Connie becomes foster-mother to her niece.

Connie struggles to settle with the baby. A woman is found dead in a vacant lot. Another is found dead in the laundry room of her building. The Lieutenant dresses up for a lunch.

When NYPD Auxiliary Police Officer Heather Peterson is murdered, the detectives find her diary that details the sexual habits of the police officers at the 15th precinct. These findings cause the detectives to suspect the officers of the 15th precinct had something to do with her death, and the investigation of the cops cause tension between the officers and the detectives.

IAB start interviewing the officers who were in the diary, and Sipowicz and Clark are blamed as rats. A social worker appears to have taken her own life. A former cop wants his ashes buried at the precinct.

Andy and Theo move out. Tony thinks about calling it a day with his ex-wife. Sipowicz and Clark Jr look into the threats made to Clark Sr. A distressed, schizophrenic young man keeps saying "she can't breathe".

Connie and Rita find young children home alone, living in squalor. Tony's ex-wife is found dead. A carjacker is killed, and cocaine is found in the car.

Clark is placed under arrest after police find heroin in his car; detectives search for clues when a woman is beaten to death with a cordless drill; a murder victim's obsession with clean living may have led to his demise.

In hopes of freeing Clark from jail, Sipowicz searches for drug dealers who might have a connection to Laughlin; McDowell and Ortiz investigate a series of rapes in a park involving a perpetrator who forced his victims' boyfriends to watch.

The detectives investigate the murder of a homosexual man who gave room and board to Latino parolees in exchange for sex; McDowell and Ortiz search for clues when a community activist is stabbed to death.

A transvestite prostitute's murder leads the detectives to two prime suspects: a pimp, and a john who claims the pimp and the prostitute set him up in an effort to steal a watch.

Sipowicz and Clark investigate when Julian Pisano is wounded in a shooting incident; McDowell and Ortiz assist a woman who doggedly pursues justice when she's conned out of $100; Clark grows concerned when his father stops returning his phone calls.

Jones accidentally shoots a 13-year-old boy while pursuing a murder suspect; McDowell and Ortiz search for answers when a man whom police escorted from the scene of a domestic dispute is found dead.

The detectives investigate the murder of a homosexual financier whose death might be tied to a marine; Medavoy and Jones search for answers when a strangler attacks a Russian mail order bride; Haywood feels threatened when a murderer's conviction is overturned.

As Andy and Connie prepare to finalize the adoption of baby Michelle, Frank Colahan's mom and dad show up. Connie sweetly and sincerely tells them they want the grandparents to be part of Michelle's life to the fullest extent possible.

The murder of a man who frequented a betting parlor leads Sipowicz to an old friend; Jones searches for the man who attacked Haywood; the detectives research the Colahans' background.

A meek and mousy young woman is found beaten to death on the floor of her apartment. Her brother-in-law is very upset but not about her death--he was paying her money to use her apartment for an extramarital affair.

The detectives hunt for a man suspected of killing minorities to avenge injuries his brother suffered during the first Gulf War; Sipowicz and McDowell plan to marry.

The detectives investigate the shooting death of a man whose brother is a registered sex offender; and when Captain Fraker's trial gets underway, Sipowicz worries that his own testimony may have harmed the prosecution's case.

Sipowicz and Clark investigate the death of a transvestite whom a friend insists was having a relationship with a married man; a surgeon's hand is badly cut during a robbery; and Rodriguez testifies in the Fraker trial.

The detectives search for clues when a group of perpetrators torture a man for no apparent reason; a woman reports her husband as missing, but Sipowicz and Clark suspect she's not being completely forthcoming; and Fraker testifies in court.

The detectives investigate the strangulation death of a former porn star; a thirteen-year-old boy holds the key in implicating his father in his mother's murder; and the jury reaches a verdict in the Captain Fraker trial.

The detectives investigate a strangulation murder that may be tied to one of Diane Russell's cases; Russell consults a doctor when she discovers a lump in her breast; Medavoy and Jones investigate an arson linked to two boys.

Sipowicz, Russell, and Clark attempt to connect the murder of a young woman to two other killings; Medavoy and Jones investigate the shooting death of a mother whose children feared her.

A woman survives the serial killer's attack, and her account prompts the detectives to focus on Carlin, his partner, and a bodyguard; Medavoy and Jones investigate when an off-duty officer kills a man; and McDowell comforts Russell during a biopsy.

When another woman is murdered by the serial killer, the detectives arrest a suspect... and discover the killer's identity; and expecting a baby, Sipowicz and McDowell decide to get married.

Sipowicz and Clark search for two burglars who terrorized a retired cop and his wife; Medavoy and Jones assist an author who wrote a book on how to avoid paying income taxes; and Jones deals with Michael's father.

A man armed with a bomb walks into the station house and handcuffs himself to McDowell; unless the detectives release a Russian mobster from jail in one hour, the bomb will detonate.

When a Jewish jewelry-store owner is murdered, the detectives focus their investigation on two suspects: a Caucasian man who converted to Islam, and a rap star whose expensive jewelry turned out to be fake.

Sipowicz and Clark search for an African-American driver who fled the scene of a hit-and-run accident after unwittingly running over an Italian mobster's young daughter.

Sipowicz and Clark investigate the shooting death of a jogger who'd been having an affair with a police officer; and Medavoy and Jones search for answers when the body of a comedy club owner is found in the trunk of a stolen car.

A new detective, Stan Hatcher, joins the squad; the detectives investigate a shooting death that Hatcher believes is linked to a dispute between gang members; and a man insists that his young daughter has been kidnapped.

The squad investigates the murder of two drug dealers, and the discovery of a body mistakenly listed as a victim of the World Trade Center attack. McDowell arrests the daughter she gave up for adoption.

Connie and Rita find young children home alone, living in squalor. Tony's ex-wife is found dead. A carjacker is killed, and cocaine is found in the car.

A boy on a bicycle is murdered. Connie's sister posts bail for her husband.

Andy and John attend a shooting where a man is shot in the groin. Connie's sister turns up, pregnant and beaten by her husband.

A man armed with a bomb walks into the station house and handcuffs himself to McDowell; unless the detectives release a Russian mobster from jail in one hour, the bomb will detonate.

Danny could be in big trouble for roughing up a suspect. Detective Connie McDowell joins the team for the day.

The detectives investigate the separate murders of two supposedly upstanding citizens: an ex-convict turned community activist and a doctor who donated time to helping drug addicts and prostitutes.

Sipowicz, Russell, and Clark attempt to connect the murder of a young woman to two other killings; Medavoy and Jones investigate the shooting death of a mother whose children feared her.

The detectives investigate a strangulation murder that may be tied to one of Diane Russell's cases; Russell consults a doctor when she discovers a lump in her breast; Medavoy and Jones investigate an arson linked to two boys.

McDowell and Ortiz investigate the death of a woman found in her apartment, where an ex-con neighbor is suspect. The investigation into Scott's murder points towards his friend. Andy thinks about the future. Rita meets John's father.