The countdown to Costas and Sipowicz's wedding begins. Meanwhile, Simone confronts Russell about her drinking.

Sipowicz leads the investigation to nail a rapist; Irvin reports a gay-bashing incident to Simone, who also learns of Russell's drinking problem.

A witness's obsession with Simone jeopardizes a murder case; a bookie is slain; Sipowicz and Costas undergo pre-wedding counseling.

Simone works with a detective to get info on a murderous arsonist; a woman fears retribution if she identifies the men who robbed her; Martinez spars with Fancy.

A gunman goes on a shooting spree and then disappears; Fancy's brother, a uniformed cop, is involved in a racially charged confict with his superior officer.

A witness in a homicide case is eager to please Simone; Sipowicz takes a personal interest in a robbery-murder in his old neighborhood.

A graffiti tagger is beaten to death; Costas is shaken up by a purse-snatching; Donna nears the brink of a breakdown.

The serial killer is assassinated; Simone and Sipowicz arrest a disgruntled immigrant who may be a terrorist bomber.

A cop is suspected of icing a pimp; Medavoy is jealous after Donna has coffee with her ex-boyfriend.

Sipowicz and Simone go upstate to follow a lead on a multiple homicide; Costas doesn't like Sipowicz's response to her wedding plans.

A murder investigation gets tangled up in red tape; Simone reaches out to a pal who's involved in some shady business; and women report a beauty-aid con.

Simone works around Det. Solomon and is allowed to question the serial-killer suspect.

A serial killer has apparently struck again; Fancy's former informant approaches him with alleged information about a heist.

A suspect is sought for a gay-bar robbery-homicide; Medavoy sets up a sting on a fraudulent fortuneteller; Dan Breen wants to see his son, against Sipowicz's wishes.

Suspects are questioned in a gruesome murder case; Dan Breen is beaten by his mentally unstable son.

Simone's young acquaintance is implicated in a schoolyard shooting; a gunshot victim is blamed for his ex-girlfriends' HIV; Donna's sister moves in with Donna and Medavoy.

Simone and Sipowicz crack a case involving the murder of a chiropractor's wife; Martinez provides security for the daughter of a Costa Rican banker.

Det. Bobby Simone joins Sipowicz to investigate the shooting of a wiseguy.

Haverill comes down hard on Kelly, who investigates a drive-by shooting. Meanwhile, Sipowicz must remove a deceased detective from a prostitute's apartment.

Kelly teams with a Chinese-American detective to investigate a cop-killing; Det. Lesniak joins the precinct.

The verdict comes in on Licalsi; Internal Affairs is on Kelly's back and wants to question Medavoy about the ledger. Meanwhile, Sipowicz and Kelly investigate a double homicide.

Kelly's testimony in Licalsi's murder trial raises questions about him suppressing evidence.