Lesniak deals with a perpetrator and his "high priced lawyer and shrink" when he repeats the offense. Meanwhile, Detective Solomon uses a fast pull to take a possible serial killer case away from Simone after he brings in a possible suspect. One of Fancy's old contacts, Vinnie Greco, brings in a tip about a couple of guys looking for some heavy arms to do an armored car job and Sipowicz works with him, but Greco is working for someone else against Fancy. Sipowicz invites Andy Jr. over at his place for dinner where his son tells him that he is joining the Air Force. Also, Sipowicz proposes marriage to Sylvia and this time, she accepts.

Simone and Sipowicz investigate the brutal murder of the teenage daughter of a woman whose ex-husband has made threats against her. Meanwhile, Lesniak and Martinez's latest case involves them trying to nab a con artist who sells a black box to homely women, promising them beautiful skin. The new zone commander, Captain Clifford Bass, checks in and lets Fancy know his overtime policy, which doesn't sit well with Sipowicz when it compounds their investigation. Elsewhere, while Simone's romance with Benita becomes more serious, he also deals with a childhood friend, named Ray, who is now involved with a nightclub that is frequented by wise guys and other criminals.

Sipowicz disagrees with Sylvia over their wedding arrangements, for he wants to travel to Maryland for a quick one, whereas Sylvia wants a traditional Greek Orthodox service. Shortly thereafter, Simone and Sipowicz investigate an execution-style murder of three people at a fast food restaurant and the investigation leads them to travel upstate to look for a possible suspect. While there, Simone tests his homing pigeons by releasing them, hoping they will make it back to New York. Meanwhile, Lesniak meets an old high school boyfriend of hers, now a doctor, while investigating a rape case with Martinez, who develops a case of jealousy.

Sipowicz investigates the murder of a pimp in which evidence points to a cop that Sipowicz once helped out with a problem of his. Later, Simone mentions the case to his girlfriend reporter Benita, and soon regrets it when the story hits the papers which leads to the suspect committing suicide. Benita denies leaking the story, but Simone refuses to believe her and ends their romance. Meanwhile, Donna's former boyfriend, Harold, a ex-New York Ranger hockey player, returns to the city and meets with Donna, while Meadvoy overreacts with jealousy. Donna confides her situation with her sister, Dana, but she manipulates Donna by sowing seeds of anxiety into her about Medavoy and his neurosis. Elsewhere, Martinez begins to develop feelings for Lesniak.

Simone and Sipowicz investigate the race-related murder of a Puerto Rican teenager who was attacked while spray painting graffiti in Little Italy. Meanwhile, Medavoy meets Donna's former boyfriend, Harold, when he comes to the station to file a car vandalism report, while Donna makes a tough decision about her relationship with Medavoy. Also, Sylvia is mugged and she later tells Sipowicz a secret from her past about being raped as a teen.

A witness to a crime smells alcohol on Russell's breath and uses it against her, and Sipowicz smells the same. Simone then confronts Russell about her drinking, but she tells him to mind his own business. John Irwin comes to Fancy for help when he and his gay lover are beaten up by gay-bashing officers in another precinct. Meanwhile, a terminally ill infant helps the detectives locate a serial rapist. Medavoy meets with his ex-wife who tells him that they should get back together for their kids and when Donna finds out, she tells him that their relationship is over.

Lesniak's preference of her lesbianism quickly gets around the precinct, which gives her mixed reactions. Meanwhile, Sipowicz clashes with Simone throughout their investigation of the senseless murder of two kids, which is only the start of a really bad day which also includes Sipowicz dealing with Sylvia's morning sickness, and Simone dealing with Russell who falls off the wagon.

Medavoy and his wife, Marie, split up once again and she comes down to the station to have some hard words with Donna, while he decides to crash there since he cannot afford a place to live. Meanwhile, Simone and Sipowicz team up with Detective Harold Ng to probe the death of a Chinese girl whose leg has a strange marking on it which may have been self inflicted. Martinez and Lesniak look into the robbery case where a woman in a wheelchair lets a man claiming to be a policeman into her apartment, while the husband reveals a clue to Martinez that he has been seeing a prostitute on a regular basis and whose pimp might have planned the robbery. Elsewhere, Sipowicz does not want to accompany Sylvia to her latest doctor's visit, and Martinez gets an opportunity to find out where Lesniak really stands on her sexuality if she's really gay.

Sipowicz has race relation problems with the organizer of a local basketball game, held in the memory of a young boy, which erupted into violence by the gang members on the opposing sides which left two dead and seven wounded, and was witnessed by a reporter. Fancy has problems when Sipowicz racist colors come to light and has him removed from the case, much to his anger.

A strange woman walks into the precinct and gives Sipowicz and Medavoy some information about a disappearance that occurred eight years ago and where the body may be located. Meanwhile, domestic violence in Russell's parents apartment leads to tragedy when her drunken father is found murdered in their apartment and her brother, Doug, claims to have shot him in self defense. But Simone thinks otherwise and presses to get the truth about what really happened to her Russell's father and soon learns that Russell's simpleton mother in fact did the deed and Doug is trying to take the rap out of blind loyalty to the family.

Simone and Sipowicz help a local FBI agent, named Mike Frances, to investigate the murder of a local Italian mobster. However they are forced to commit robbery while working undercover for Agent Francis, and have to place a bug in the mob hangout. When two wise guys come to the station to file a robbery complaint, Russell and Medavoy catch them in the act of filing a false report. Meanwhile, Donna's hairdresser, Marina, tells her that she has a problem with her ex-boyfriend. He wants to hijack Marina's current boyfriend's truck, and Martinez goes undercover as Marina's boyfriend. But Lesniak is unable to hide her jealousy and possessiveness. Elsewhere, Andy Jr. learns more about being a beat cop with more pointers from his father Sipowicz Sr.

Sylvia is now nine months pregnant and ready to give birth any day so Sipowicz is on the edge. Meanwhile, Simone and Sipowicz, with Andy Jr. along for the ride, investigate a case where the drug-addicted nephew of the victim of a robbery-homicide is found holding the stolen goods. Meanwhile, Medavoy, Martinez, Lesniak, and Russell all join forces to work on the robbery-murder of a bouncer where the leads first lead to a biker, then to a check cashing forger, and to his co-worker. In the mist of the investigation, Martinez and Lesniak finally reach an agreement that they are not right for each other and quietly break up by agreeing to try a platonic relationship. Also, Donna contemplates an administrative job offer in California.

Sylvia confronts Sipowicz about her suspicions that he is going to late-night bars and drinking again, and the effect is everywhere. Lt. Fancy is forced to sent him home after Sipowicz walks in one morning drunk. Sipowicz even fights with some street punks, gets beaten up, and Simone offers to look for the men that beat Sipowicz up. Meanwhile, a new administrative assistant, named Lucy, arrives as Donna's replacement. Also, Russell investigates a young woman, named Angela, who claims to have been stabbed by her jealous boyfriend. Simone, following a lead from a streetwalker named Deena, finally tracks down and confronts the two thugs who murdered Andy Jr. and guns them both down in a hail of bullets.

A foreign prince and princess are assaulted - the princess goes into a coma. Sipowicz and Simone investigate, with Mike Roberts help, who provides them with some information about Prince Foresmann's contacts over some stolen artwork. Meanwhile, Martinez's first delegate situation gets a resolution that keeps Officer Ortiz out of trouble with the department. This doesn't work out as planned when two women claiming to be his wife are arrested in a scuffle. Russell begins a new undercover job that involves her getting into a relationship with alleged drug dealer, Jimmy Liery, that might require her to start drinking again. Elsewhere, Geri continues to try to win Sipowicz's affections and Medavoy for once feels good about himself after his diet. Also, Martinez asks the anti-crime PAA, Gina Colon, out on a date.

While tracking down Jimmy, who drugged and date-raped her the previous night, Russell works with Martinez and Medavoy on a case where a man with a muscular dystrophy was killed in a very tight knit community. Meanwhile, Simone and Sipowicz work on another murder case that may have been masterminded by a married couple. Also, Fancy wrestles with Captain Bass and knowledge of the fact that Simone is going to be promoted to Detective 1st Grade, and Sipowicz isn't.

Simone and Sipowicz investigate a murder, but the procedures they must follow make them unpopular at the precinct when a fellow cop might have been involved. Meanwhile, Medavoy and Kirkendall investigate the murder of a young girl where the only clue is a videotape that starred her crushing worms. Russell goes missing and eventually turns up in Simone's apartment where she recalls to him that her father molested her as a child.

Two trans women, named Angela and Peaches who assisted Russell on a previous case, arrive at the precinct where 'Angela' is seeking protection from a man who's beaten him. But afterwords, Angela is founded murdered and Sipowicz, Simone and Russell investigate. They eventually receive help from Simone's former junkie informant, Arthur Cartwell, to find the perp. Meanwhile, Kirkendell investigates the theft of some small items by a old friend's parents. Kirkendell confronts her old school friend, Lucy Hastings, to persuade her to return the items as well as enroll in a substance abuse program. Elsewhere, Fancy's wife, Lillian, tries to sell some health food products at the precinct, but Fancy begins to think that it is not a good idea.

Simone and Sipowicz get another case involving the shooting of a rap artist who refuses to cooperate with them in the identification of his assailant. Meanwhile, Abby tells Medavoy that she and Kathy are trying to start a family and asks him to donate his sperm to her so Abby will get pregnant. Officer Szymanski, the racist cop who pulled over Fancy, tells him that he thinks Fancy was one of the ones responsible for his being set-up and caught in the alleged theft of a drug dealer's money. Also, Simone is approached and propositioned by FBI agents to help them with their ongoing investigation into the affairs of mobster Joey Salvo. Elsewhere, the night shift detective, Vince Gotelli, tells Simone and Sipowicz about a heart medical condition of his.

Medavoy launches his own investigation when Abby, and her girlfriend Kathy, are both shot by an intruder in their apartment in which Kathy dies and a grief-stricken Abby cannot bring herself to answer Medavoy's questions about her past and her former lover who may have been the assailant. Meanwhile, Simone, Sipowicz and Russell investigate a suspect after the charred body of a young woman is found in an abandoned vehicle. Also, Gina develops complications with her pregnancy and is taken off work for a few weeks.

After Israel hangs himself, Sipowicz investigates a clue which is a bible verse that Israel pointed out to him, which leads Sipowicz and Simone to set up a complex sting operation to find out if the father of the murdered boy really was the one that set the whole Israel frame-up. Meanwhile, Medavoy and Martinez look into a doctor who is helping out the homeless by getting them a job with insurance benefits that he helps collect.

Simone and Sipowicz investigate the murder of a nurse where the suspects include a struggling actor, a crazy man, and eventually a uniformed officer from the precinct named Tommy Richardson. Meanwhile, Medavoy and Kirkendall look into the death of a bicycle messenger who was killed for just trying to help a man whose backpack was stolen, so they determine that the backpack contained drugs. When they get a suspect into custody, Kirkendall figures out a clever way to get an ID on the suspect who won't cooperate. Also, Sipowicz's doctor tries to talk to him about how to deal with his medical problem, but Sipowicz won't listen.

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.

Sipowicz returns to work after his successful prostate surgery, but apparently too soon, for he has an accident while interrogating a suspect. He is given desk duty to help Simone and Russell investigate the murder of a woman's boyfriend by her ex-husband, the ex-husband later revealed to be searching for his daughter who's gone missing while in the ex-wife's care. Meanwhile, Simone is called upon by Detective Nick Savino to help investigate a missing persons report that is being filed by the nephew of one of Simone's apartment tenants. Based upon past exchanges between the missing woman and Henry Coffield, another building tenant, Coffield becomes a suspect. Former administrative aide Naomi Reynolds shows up at the station, now wearing a private security uniform and speaking in her natural Australian accent, to visit Simone, hoping to tell him that her situation with the INS was resolved and she is now furthering her pursuit to one day become a NYC police officer.

A murdered couple is found where the dead man is a car salesman and the woman is a prostitute. Simone and Sipowicz look into the salesman's death, while Medavoy and the other detectives look into the prostitute's death, where the M.O. of the suspect is to buy used condoms from a prostitute and then mix the spent semen with his own to cover his crime. As Sipowicz recovers from his surgery, he finds that a recent blood test is not favorable and once again keeps his medical problem to himself.

Simone and Sipowicz work with Cohen to investigate the death of one of Cohen's witnesses and her son. Evidence points to the opposing attorney having some involvement with the arrangement of the homicide. Meanwhile, Russell and Kirkendall try to help a man locate his missing daughter. Medavoy and Martinez look into a corporation dealing with fake sports memorabilia, where Medavoy is taken in with the blond employees who reminds him of the departed Donna. Also, when Sipowicz thinks about his low sexual functions, his doctor prescribes the wonder drug Viagra. In the mist of all the cases, Simone and Russell decide to get married on their lunch break, but their cases get in the way of it all.

The detectives of the 15th Precinct investigate a double homicide involving one of their own, an alcoholic cop who seems to have done the right thing, but can't remember key details about the incident.

The detectives investigate a grisly murder in which an elderly woman's hands and feet were cut off. Simone's health continues to deteriorate.

Sipowicz helps his ex-wife deal with a drunk-driving violation. Simone's body rapidly succumbs to infection in the wake of his heart transplant.

The detectives search for the truth when a white off-duty police officer with a history of racism fires upon an African-American undercover cop. Dolores is arrested for shoplifting.

Sorenson and Sipowicz investigate the murder of a nine-year-old girl whose body was discovered inside a locked basement. Medavoy and Martinez assist an elderly man who believes that his young girlfriend was pressured into embezzling money from him.

Sorenson and Sipowicz investigate when a fellow officer shoots a drug dealer; Russell and Kirkendall intercede on Gotelli's behalf when a disgruntled man repeatedly vandalizes his mobster neighbor's car.

Tensions mount as the Cullinan trial approaches. Mike Shannon brings a problem to Sorenson. Danny kisses Diane. There's a shooting at the courthouse.

Danny and Andy catch an assault that looks like it was done by the boys in blue. Jill considers dating her ex-husband.

Medavoy and Jones look for a woman reported missing by her "distraught" husband; Andy and Danny deal with a snotty, eccentric art owner whose collection has been stolen.

The detectives investigate a multiple homicide at a fast food restaurant; an addict gives his 5 & a half year-old daughter to a drug dealer as collateral on an overdue loan; Internal Affairs reopens the Kirkendall case.

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.

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.

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.

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.

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.

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.

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.

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.

Andy's off-duty and slightly underhanded work to prove that Hatcher killed his own wife lands him a transfer out of the 15th precinct and into the Bellevue Morgue engineered by Detective Hatcher. Meanwhile, the squad is up to their whips and chains after a dominatrix is found murdered.

A man who cared for his brain-damaged brother is found dead; Medavoy falls for a wealthy woman while investigating an apartment rental scam; Bale tries to nail a man who offered the detectives a bribe.