Season 4

Greg and Andy consider going on a diet. Simone considers his feelings for Diane. A body in a trunk leads to a gun chase and the hunt for the killer. The squad greet a new PAA.

Det. Morrissey enlists the help of Andy and Bobby on his missing child case. Cotelli and Martinez tout for votes in the election for officer's rep. Medavoy and Sipowicz start their diet plans.

Simone struggles to make sense of the shooting at the apartment block, which he now owns. Meanwhile, he and Sipowicz re-open an old case, which may have imprisoned the wrong man. Greg and Andy weigh-in at the end of the first week's diet. The result is out for the Delegate's election.

An old adversary of Sipowicz's is killed in a drug related shooting. Andy and Bobby have to investigate his involvement. Medavoy and Martinez search for the killers in a grocery store shooting.

A 'Prince' is robbed of expensive paintings. Martinez gets his first case as Delegate. Russell goes under cover.

A Limo driver is shot. Witnesses blame it on the passengers. Simone and Sipowicz search for his last clients. A new female detective joins the squad and immediately gets involved with a man receiving death threats. Simone helps Savino search for the killer of the girl shot through the peep-hole.

A mother claims her daughter has been raped by a gang of prep school boys. Simone investigates. Rusell is having problems working under cover. Sipowicz has to interpret the ramblings of a mentally disabled young man.

Simone and Sipowicz investigate a street shooting when witnesses name a man who is supposed to be in jail. Macey, a young man who was previously in the care of Lt. Fancy, is caught carrying drugs. Medavoy meets with more disappointment.

Russell wakes up in Jimmy Leiry's bed and doesn't know what happened. There's been a strangling in a mainly Polish community. A man is found shot dead, in a quiet neighbourhood. Everybody knows him, but nobody saw anything.

A young thief tells Medavoy and Martinez about a body in an apartment. Simone goes after Jimmy Leiry.

Two diamond dealers claim they've been robbed of over 1 million dollars worth of diamonds - and the sister of one of them is involved. Gina is attacked at knifepoint and ends up in hospital.

Sipowicz and Russell have a heart to heart. An off duty cop, involved in a shooting, causes a rift between uniform and plain-clothes when Simone and Sipowicz investigate. A young girls body is found in a rubbish skip.

A man, found hanging, places suspicion on a precinct PAA. 2 rival groups of manual workers confront each other and one of them is killed.

A junk yard owner finds the body of a tortured woman in the boot of a car. Gina returns to work. A man, with massive head trauma, is found on a vacant lot, next to where he lives.

Lt. Fancy falls fowl of an over zealous patrolman. Sipowicz is reminded of his son's death when he and Simone investigate a series of bar hold-ups. Martinez, Medavoy and Russell have to deal with a confidence trickster.

A dead woman, found in an alley appears to be another in a series of brutal rapes. Simone and Sipowicz investigate. The rest of the squad tries to find out why shots fired from a bus injured a woman and a child.

3 Latino men shoot another, who's walking with his girlfriend, in what looks to be a gang related feud. Martinez and Medavoy search for the killer of a man in a car repair shop. Russell and Kirkendall investigate the death of a baby, while in the care of a child-minder.

2 male transvestites, previous acquaintances of Russell's make a complaint against a boyfriend. The parents of an old school friend of Kirkendall's accuse their daughter of theft.

Rap star 'Daddy Kool' is shot but refuses to cooperate with the police, to catch the shooter. Lt. Fancy is accused, by a uniform cop, of setting him up to rob a drugs dealer. Medavoy gets a proposition.

A shooting in a Hispanic club leaves 3 dead and 5 wounded. A mother claims her husband beat her and raped her daughter. Medavoy awaits a call for his services. Simone is approached for information.

Medavoy and Martinez search for a man who hijacks a bus to get people home quicker. Simone gets into trouble with IAB. Sipowicz does his best to protect a witness to a robbery and rape.

Simone gets caught between the FBI and IAB. Sipowicz and Russell investigate the death of a woman after getting a warning from her Psychiatrist. Medavoy and Martinez have to tread carefully when dealing with a reporter who has been mugged.