Four months have passed since the death of Jimmy Salvo. Bobby's working odd jobs while he's been suspended pending IAB's investigation. Bobby stops by the station to talk to Andy, while there he notices that Gina's showing signs of pregnancy. She hasn't formally announced it and is reluctant to let James do the right thing. Bobby tells Andy about the FBI seeing him the other night, he wants to set up a plan to make things right. Meanwhile the detectives investigate a couple of routine homicides. Bobby tells Lt. Shannon about Andy's presence. Jill works her source, Leo Cohen, to try and get information out about the pending indictments against Andy and Bobby. The FBI tells Bobby he is on his own. They had other plans for Lt. Shannon, after Andy had given his testimony. When the squad is called to a scene, where the suspect in Andy's case is holed-up, a shot is fired in Andy's direction. Shannon is identified as the shooter. The whole mess gets unraveled; it is revealed that the 15th squ

Things are back to ""normal"" at the squad when Bobby returns to work. Gina still hasn't officially announced anything; however, after thinking it over she accepts James' proposal for marriage. Bobby and Andy look into a shooting death that occurred during a robbery at a bar. The suspect that the patrons point to is a man whom Bobby and Andy discover is dying and was on a mixture of drugs and alcohol at the time that he shot his gun at someone. Meanwhile, the rest of the squad stakes out the hotel where a serial rapist has been committing his crimes. Gina, now anxious to get married, gets James to make arrangements for a quick ceremony. They'll have a family type ceremony later. Bobby is glad to be back on the job.

Greg receives a disturbing call, Abby's been shot and Kathy is dead. The investigation puts a strain on Greg's relationship with Abby as he must ask the hard questions about what happened. Eventually Abby points to an obsessive bitter ex-lover as the mastermind behind the break-in. On the other pregnancy front, Gina develops complications that will take her off the job for a few weeks. A young woman's charred body, complete with a bullet wound, is found in an abandoned vehicle; Bobby, Diane and Andy investigate. They miss a chance at getting their prime suspect when the night watch falls asleep while on their stakeout of the suspect's home. When he is apprehended, the suspect claims it was an ""accident.""

Andy and Bobby investigate the murder of man where the only witness is woman who's a little off the deep end. Meanwhile, Andy also contemplates the meaning of ""Pop Goes the Weasel."" A cab driver reports a robbery that is just another in a string of cab robberies that Greg and James begin to investigate. A replacement PAA named Naomi, with a lot of initiative, arrives to sub for Gina who will be off work for at least four weeks. Greg and James' investigation makes the brother of a gypsy cab driver as the perp; the gypsy cab driver can't deal with the dishonor his brother has brought upon the family. The life of Andy and Bobby's witness is in jeopardy when their suspect's lawyer has her kidnapped. When they get some incriminating evidence on the lawyer, Cohen uses his influence to help find the location of the woman. When Cohen wants to keep his word to the incriminated lawyer, it doesn't sit well with Andy; however, Jill supports him. Naomi obtains some library research for Andy's quest

A son is bitter about his father's death and offers $5000 in cash to anyone who can produce the killer. Andy avoids getting the eye surgery he needs. Simone and Kirkendall try to work the case, despite the impedance to the investigation caused by the reward. A drug-addicted pregnant mother gives up her kids up for the reward. Sipowicz and Russell investigate the rape of a 9-year-old girl. The victim's mother is convinced that the perp may be a retarded youth from their building who's going through adolescence. Later the girl is able to recall more details that get them on a lead on the real perp, a man who says he was rehabilitated. The outcomes of their investigations have different effects on each of the detectives. Diane and Bobby engage in some intense activities that cause them to believe they've made a baby.

A family's home is broken into it, the wife and baby are shot in the head and the father only has a belly wound. Simone and Sipowicz like the father for the crime, theorizing he may have done it for insurance money. Retired detective Vince Gotelli is the insurance investigator. An old friend of Arthur's shows up at the precinct. He is dying and has a story about a 15-year-old murder. Russell, Martinez and Medavoy investigate the murder of a record company executive who wasn't very popular.

Simone and Sipowicz investigate the murder of two roommates. A guy that Medavoy knows comes in with story about a man wanting to hire a hit man. Medavoy wants to play the part of the hit man when they go to arrest him; since nobody thinks he looks the part, Martinez gets the role. Kirkendall and Russell investigate the claim of a wealthy woman that her maid did not accidentally donate the diamond necklace that the woman kept in a safe place disguised as a soup can. Diane reports to Bobby that she is 4 days late.

A young boy is reported missing by his parents. Simone and Sipowicz agree to look for the young boy, when the father tells them it may have been his fault for letting him talk to a homeless man. Instincts tell Andy that the father is guilty. They locate the homeless man, named Israel; however, communication is difficult because he is a mute. Unfortunately, the boy's body is found and the detectives now must determine if Israel is responsible or perhaps the boy's father. Andy may have tipped his hand to the boy's father that he likes him for the murder. So for a while Andy bows out of the case and Diane steps in. Meanwhile, a Hasidic Jewish girl is murdered and the other detectives have to juggle the need for their investigation against the needs of her faith for a quick burial. Israel is brought in for further ""questioning"" to let father think suspicion has been removed from him. The father watches the interrogation of Israel with interest. The father has set-up all the evidence to poi

Andy begins to make sense of the Bible passage that Israel pointed out to him; only to discover that Israel has hung himself. The detectives aren't sure how to proceed with the parents now that Israel is dead; Fancy is out of the office because his daughter Jennifer has had an appendicitis. The detectives decide to let the parents know about Israel's death, but lead the parents to believe they have a witness that saw the father plant the shirt in Israel's ""home."" Diane begins to reach the mother. Bobby senses the father is jealous of all the attention. The detectives decide to lie low and wait for the father to make a move. It doesn't take long and the father contacts Bobby, who tries to connect with him like Diane is doing with the mother. Emotions run high until a confession is finally delivered. Meanwhile, the other detectives find a doctor who is helping out the homeless by getting them a job with insurance benefits that he helps them collect.

Bobby isn't quite sure, but he thinks he overheard Naomi speaking with an Australian accent. An old friend from his school days stops by to ask Andy to talk to his daughter about the company she is keeping. The daughter is living with a woman who's looking to eventually change her sex, but that isn't the issue, it's her boyfriend is an unstable element. So unstable, that despite Andy's visit the next morning the daughter's roommate is murdered. Another of Andy's old schoolmates might be the key to unraveling the mystery. Also for some unexplained reason, Sipowicz seems unusually agitated with Fancy. Meanwhile, Greg and James look into where a man is getting a lot of teeth that contain gold fillings and uncover a small grave robbing operation. Later, Naomi confesses to Bobby about her Australian origins and her desire to become a police woman.

Diane tells Bobby that she is pregnant. The detectives are called to the scene where two women are murdered. Everyone seems to point to the drug-dealing husband. They go to raid the house where some dealers are held up and Diane gets involved in a shooting situation that makes Bobby angry. Meanwhile, Greg and James look into the murder of a prostitute, despite James' complaints about a back problem that will later get him taken out of the squad on a stretcher. Naomi tells Bobby about her problems with her landlord turning her into INS.

A man finds an interesting looking box, only it is oozing a liquid that turns out to be the blood from a woman's body that is stuffed inside. Simone and Sipowicz investigate the crime and meet the victim's brother, a man who is more concerned with drinking a particular brand of soft drink. Russell investigates the death of a child whose parents do not seem fit to raise a child. Kirkendall and Medavoy look into the death of a young boy, whose parents later suggest that person who killed their son can be forgiven, after all the Lord has forgiven him. Jill tells Diane that she knows that she is pregnant.

Bobby, Diane (and later Andy) investigate two stickup murders held at ATMs. When they get a line on a possible suspect, they use Jill to appeal to his mother to help them reach out to him. Meanwhile, Greg attempts to sort out a case where he can't determine if there really is a twin, when a man comes in to report that his twin brother has threatened violence against his former girlfriend. All along, Andy contends with a medical problem involving his prostate and he is less than forthcoming with what the doctor has told him about his condition. Sylvia tells Andy that she is ready to get back to work.

A drugs for guns deal gone bad, results in the death of a white youth in a black neighborhood. Diane begins feeling ill and takes some lost time. The father of the victim comes to the squad and blows up screaming racial slurs when he finds out where his boy was killed. Simone and Sipowicz try to conduct their investigation in the midst of the racial turmoil that has been created in the squad room, between Fancy and the father. Medavoy and Kirkendall investigate the strangulation and dismemberment of the mother of young boy, who's discovered his mother's body in the refrigerator. Bobby worried about Diane finds her at the apartment only to find out that she has lost the baby.

Bobby and Andy investigate the murder of a nurse. Suspects include an actor, a crazy man and eventually a uniform, Tommy Richardson, from the 15th precinct. During their investigation, Andy's doctor comes to the squad to see Andy, who won't return his calls. He wants to help Andy confront what's happening to him; however, Andy goes off him because he would rather not deal with the situation. Meanwhile, Greg and Jill look into the death of a bicycle messenger who was just trying to help a man whose backpack was stolen. They determine that the backpack contained drugs. When they get a suspect in custody who won't talk, Jill figures out a clever way to get an ID. At the end of the day, Andy and Bobby's investigation points toward Richardson.

Richardson confronts Sipowicz and Simone about their impending questioning of his wife. The questioning reveals nothing, except that Richardson is a real bastard. Greg goes upstate to Abby's side when she goes into labor. Sylvia returns the job. Kirkendall and Russell look into the theft of a graduate film student's camera. Only the graduate student seems more interested in dispensing his own justice. ""Upstairs"" John Irvin stops by to tell the detectives about the new graphics art business he started near by; only no one is there but Dolores; Fancy is on the phone. Medavoy returns, from Abby's false alarm. They have a hard time making a case that will stick, without a murder weapon. Sylvia finds out about Andy's medical condition from his doctor. He agrees to go for further test and the surgery he is going to need.

Simone and Sipowicz look into the shooting of two women (one was killed) who were raped by a group of men in an apartment owned by a former crack dealer named Jamal who was crippled in a previous shooting incident. Caught by his doctor at the hospital, Andy tells Bobby about his prostate trouble. Meanwhile, Kirkendall, Russell and Medavoy investigate a shooting at a clinic. When they get their female suspect into custody, a security guard from the clinic who was her secret admirer comes to the precinct demanding she get a second chance. Medavoy takes him down.

Tommy Richardson's wife, Laurie, stops by to pick up his time records as Tommy has transferred to another precinct. Laurie expresses some concerns about his behavior, especially after she catches him in a phone conversation with another woman; she also shows Bobby and Diane signs of physical abuse. Bobby and Diane contact the woman that Laurie caught Tommy having a phone conversation and interview her, but it leads to nothing but more trouble for Tommy's wife. Meanwhile, Greg and Jill look into death of a man who was shot and found in the bathtub of his former girlfriend. The ex-girlfriend's father is also on the scene and suffering from the electric shock he received while trying to use an electric chain saw in the bathtub. Sylvia accompanies Andy to the hospital where he is scheduled for his CAT scan. Unfortunately, the test starts to go bad when Andy begins to experience chest pains. Tommy comes to the squad and lets Bobby know that no matter what they do, they haven't got any physi

Andy prepares for his prostate surgery. James has recovered from his back problems and returns to duty; 3 weeks earlier it is reporteds that Gina has given birth to James Jr. Greg is also celebrating Abby's birth and is more than eager to show the videotaped highlights of the birth to anyone who'll watch. As Andy goes under the knife the rest of the squad get involved with a case of reuniting Army buddies, where one of the buddies is found dead. The four survivors try to keep their story straight as the detectives' try to figure out their involvement. The army buddies are revealed to be a group that was planning a big event for the year 2000 that involved an act of terrorism. Andy's surgery goes well.

Sipowicz returns to active duty, but perhaps a bit too soon as his system hasn't quite adjusted and he has an accident when later interrogating a suspect. He begins to work a case with Russell and Simone, investigating the murder of a woman's boyfriend by her ex-husband. Before the investigation gets going, Simone is called upon by Det. Savino to help investigate a missing persons report that is being filed by the nephew of one his building's tenants. The missing woman had run-ins in the past with Simone's partner and building manager, Henry Coffield, so he is suspected and the other tenants support that theory. Interrogation of the ex-husband reveals that he was searching for his daughter who's missing. Despite an agreement keeping her immune from prosecution, the detectives' work to find another means to prove the crack addict mother and her dead boyfriend were responsible for the girl's disappearance. Meanwhile, former PAA Naomi Reynolds stops by hoping to see Bobby and tell him tha

Bobby and Diane talk about making a long-term commitment to each other. At a murder scene a couple of bodies are found and Medavoy is disgusted by the amount of semen found on one of the corpses. One body belongs to a car salesman and the other to a prostitute. Simone and Sipowicz look into the car salesman's death. The other detectives look into the prostitute's death. While Andy seems to be fully recovered from his surgery, the results of a recent blood test are not entirely favorable and he is nervous about telling Sylvia. The MO of the suspected perp in the prostitute's murder is to buy used condoms from a prostitute and then mix the spent semen with his own to cover his crime. However, Medavoy gets tough and is clever with the perp during the interview. Meanwhile, the uniforms bring a man into Simone and Sipowicz. They can tie the man to their victim, but are convinced that the man's honest account of the event leading to the shooting is true. Realizing that the man wasn't capable

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. Bobby and Diane plan to get married on their lunch break. Russell and Kirkendall help a man locate his missing daughter. Medavoy and Martinez look into a corporation dealing in fake sports memorabilia. Medavoy is taken with the blonde who was named as the front of the corporation, she reminds him of Donna. Andy's doctor stops by with the results of his latest blood test, the results are good. When the doctor inquires about Andy's sexual functions, Andy is less than forthcoming and the doctor's prescribes him the new wonder drug, Viagra. Just as the time for the lunchtime wedding grows near, both Bobby and Diane's cases break wide open. Bobby & Diane just make into the office, find a witness and get married. Greg calls upon the blonde. Andy gets his prescription filled and is able to t