A double homicide casts suspicion on both the ex-wife and the former boyfriend of the murdered duo, with the dead man's murdered son holding the key to the mystery.

The renovation of a brownstone uncovers the remains of a boy who disappeared 31 years earlier, reviving a wrenching and long-suppressed memory in his childhood friend and neighbor.

The investigation into a social-club fire which claimed 53 fatalities leads to a connection between arson, illegal immigrants and the sale of green cards.

An obsessive fan pleads temporary insanity when he is charged with attempting to murder the soap-opera actress who is the center of his life.

The brutal murder of a Jewish jeweler appears to be a hate crime, but the investigation soon leads back to the man's brother and his shady business deals.

A politician opposes the prosecution of his son's murderer because it might mean revealing that his late son was gay.

The assassination of an African-American leader leads to the arrest of a man whose ex-wife was suspected of having an affair with the victim.

Cerreta and Stone find themselves on opposite sides of the fence when a storeowner kills two robbers and then claims self-defense as a justification.

The confession of an elderly man that he assisted his wife in committing suicide doesn't fully satisfy Stone when rumors surface that the man was once a Nazi collaborator.

The investigation into the murder of a young physician leads to the discovery of an unorthodox and illegal relationship between her fiance and his psychiatrist.

The initial investigation into the death of a research scientist leads to an animal-rights group until evidence surfaces that her husband's affair with a coworker may point to a possible motive for the murder.

The statement of a drug dealer who survived a shoot-out that killed a cop leads Logan and Briscoe to suspect that the cop died because he was gay and his fellow officers were reluctant to back him up.

Logan and Briscoe begin their investigation into the death of a hearing-impaired young woman by questioning her two most recent boyfriends.

A college student charges an admittedly promiscuous rock star with rape, but he claims the act was consensual.

A phone call threatening a woman's young daughter leads to a case that causes Kincaid to resign from Schiff's office because of an affair in her past.

Briscoe and Logan bet that the killing of a star athlete's father is linked to gambling debts and threats to the baseball player's family.

An assailant breaks the wrist of a tennis player prior to a tournament, and a competitor is among the suspects.

A woman's death exposes an unorthodox method of treating cancer that Executive Assistant DA McCoy intends to prove is negligent homicide.

A gay city councilman is murdered and the trail leads to a bigoted rival politician and a male prostitute.

Briscoe and Curtis have a hard time finding cooperative witnesses when investigating the murder of a college student at a rough biker bar.

A subway station gas attack, similar to one that took place in a Baltimore church five years earlier, brings Baltimore detectives Tim Bayliss and Frank Pembleton to New York to assist Briscoe and Curtis.

This crossover continues on Homicide: Life on the Street S04E12 For God and Country (II).

McCoy's new second chair, ADA Jamie Ross, is determined to prosecute as harshly as possible a carjacker who took the life of a teacher as she pleaded for her life on an audio tape discovered at the crime scene.

A headless corpse fished out of the river sends Briscoe and Curtis out to Los Angeles to obtain a blood sample from their chief suspect while McCoy and Ross back in New York try to obtain a court order for the procedure.

Back in New York with their suspect, Briscoe and Curtis try to pin down his schedule on the night of the murder, but find instead that another man was in the area at the right time and more importantly, might have a motive for the crime. But after the issuance of a new arrest warrant, McCoy and Ross have to fly to LA to defend their warrant against attacks by the man's defense counsel, Ross's former husband Neal Gorton.

The trial of Eddie Newman begins but the prosecution's chances of conviction are hampered by a "dream team" of defense attorneys, Gorton's personal pressures on Ross, the public questioning of the relationship between Curtis and Lisa Lundquist, and a surprise accusation.

It's old home week for Briscoe when an apparent murder of a teenage model in New York develops ties to Baltimore and Detectives Munch and Falsone pay a visit to the Big Apple to observe the case. Meanwhile, McCoy finds himself battling the attorney of the victim's parents for access to his clients and the Baltimore DA for jurisdiction.

This crossover continues on Homicide: Life on the Street S06E05 Baby, It's You (II).

During the search for a pedophile who raped a 10-year-old, a snitch offers Briscoe a chance to avenge his daughter's death. Meanwhile, Van Buren learns that her job is in jeopardy; McCoy is ordered to appear before a disciplinary committee because of his conduct in a DUI case; and the increasingly political Schiff worries that the rape case may adversely impact his reelection bid.

The investigation into a girl's death reveals secrets the adoptive family was desperately trying to hide.

When Briscoe and Curtis discover that a high-level federal official found murdered was recently transferred from Baltimore, they re-team with Baltimore homicide detectives. The joint investigation reveals that the victim was involved in an affair with a high-level government official whose career will be destroyed if it becomes public. The independent counsel summons McCoy and Ed Danvers to Washington to demand McCoy reveal his source or be jailed for contempt.

This crossover continues on Homicide: Life on the Street S07E15 Sideshow (II).

A murderer's shooting spree in Central Park prompts Briscoe and his new partner, Detective Eddie Green, to trace the murder weapon's origination; McCoy makes it his mission to punish the killer and the gun manufacturer.

The focus of the case returns to a politically influential family and, during the course of the trial, McCoy finds the powerful matriarch to be a formidable opponent.

The crossover starts on Law & Order: Special Victims Unit S01E15 Entitled (I).

The murder of a magazine publishing company's black CEO leads to a suspect who has a clear streak of racism and whose attorney intends on using that as a mental defect.

The murder of a bookie with a high-class clientelle leads the detectives to arrest his partner. Charged with first-degree murder, his attorney puts forth an unusual defense strategy that turns the trial into a political statement.

After a reporter accused of causing the deaths of soldiers with whom he was embedded in Iraq by reporting on their troop movements is shot and wounded on the eve of his return to the front, the ballistics report indicates that the gun belonged to one of the dead soldiers, leading the detectives to uncover who brought the gun back from the front and committed the crime.

When a paroled child murderer is run down, the investigation leads to a terrified social worker and an experimental prison therapy program.

The deaths of three women with the same name lead Fontana and Green to the nine-year-old conviction of Leland Barnes, who had shot and killed his wife in an office full of people. With two of the three witnesses against him dead and Jack McCoy on the hit list, the detectives struggle to determine how Barnes, who has been in prison the entire time, got someone on the outside to kill the only people who could keep him in jail. The investigation leads them to Leland's two sons, with surprising results.