After Briscoe, Curtis, McCoy, and Kincaid witness the execution of a criminal they brought to justice, their unique reactions to the event culminate in personal tragedies for each of them.

After an infant is found dead in his crib, it is determined he was poisoned, and all evidence points to the child's au pair.

The investigation into multiple homicides at a clothing store leads to the arrest of a schizophrenic (Denis O'Hare) who presents McCoy with a formidable opponent when he decides to represent himself.

After a college co-ed's body is found, the detectives look for a campus rapist, but the medical examiner's report puts them on a different path, one involving prostitution.

A woman is shot while sleeping and the investigation leads the police to a boy whose crack-addicted mother has entrusted him to a dealer's care.

The investigation into the murder of a model with a passion for cocaine and partying focuses on the men in her life — a nightclub owner, a basketball player, a photographer and a limousine driver.

When a young attorney is murdered shortly after he decides to file a sexual harassment claim against his employer, Briscoe and Curtis quickly discover that the alleged harasser and his wife each have an excellent motive for murder.

A down-on-his-luck ad executive becomes the prime suspect when his wife and son are killed, and his daughter wounded on a night that he claims was spent drinking.

A jogger killed in Central Park turns out to be the second wife of a former comedy club owner, who was acquitted of killing his first wife. And convicting him this time may hinge on tracing the path of a Colombian coin used as a subway token slug.

Paul Robinette places the system on trial when he defends a young black woman accused of kidnapping her biological baby from his white, adoptive parents.

Briscoe and Curtis clash with Pembleton and Bayliss, who have come to New York to investigate a subway explosion resembling an unsolved bombing in Baltimore from five years ago. The investigation soon leads to a larger conspiracy.

McCoy finds that his career is on the line when his former assistant and ex-lover accuses him of concealing evidence that helped put an innocent man in prison.

The death of a show horse leads to a trial involving insurance fraud, a sting operation and a wealthy woman's disappearance.

The victim in a 30-year-old rape and stabbing case is fearful when information received by Briscoe and Curtis creates the possibility of a new trial for the perpetrator.

A hidden anti-Semitic message in a high school yearbook offers a clue to an art teacher's murder and leads to a case that matches McCoy against "Klan lawyer" Roy Payne.

A mother, claiming that her baby was kidnapped while she was at confession, retraces her steps and actions with Curtis, which raises legal questions later when her attorney introduces a unique defense.

The investigation into a prostitute's murder leads to a married plastic surgeon as the obvious suspect, but Kincaid has a hunch that an elaborate frame-up is in play.

Briscoe and Curtis try to solve a co-ed's murder after a graphic description appears online, while McCoy finds himself up against a lawyer who is reluctant to reveal elements of her client's past.

When the detectives solve a series of murders committed by a holdup team in ski masks, McCoy must determine whether a young woman found with them is an unwilling hostage, or an active participant in the crimes.

A dead editor reveals a family dispute over the family business. Detectives find out that the victim's brother tried to sabotage the victim's reputation and business in order to gain new clients for his own, competing business -- but when forensics evidence is ruled inadmissable, McCoy and Kincaid must refocus their case , leads to a case of sibling rivalry, a protective matriarch and a corrupt judge.

McCoy and Kincaid clash over the death penalty as McCoy prosecutes a man who murdered an undercover cop during a drug bust.

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

Briscoe and his new partner, Det. Reynaldo Curtis (Benjamin Bratt), investigate the murder of a young girl who disappeared between school and her music lesson, with a blurry film from an ATM as their clue.