IMPACT x Nightline: Lori Vallow Daybell: The Doomsday Mom Murders

The emergency room death of a young woman may lead to a negligence charge for the hospital's chief of medicine.

A "self-defense" subway shooting prompts legal chaos when questions arise about who the real victim is.

A mercy killer is responsible for assisted suicides that were first thought to be routine robbery-homicides.

A young woman's upstanding boyfriend is suspected of murdering her, but the lack of evidence forces Stone to take a brash tack.

The investigation of a death yields a bizarre love conspiracy between the widow and the couple's business manager.

A mugging investigation leads to city corruption involving a councilman and the parking violations bureau.

A body in Central Park is the improbable link to a prostitution ring catering to the rich and famous.

A respected policeman is arrested after shooting a black Ivy League student, but it is later disclosed that the collegian had a sordid history.

The investigation of a preschooler's death leads to the crack-addicted mother and her boyfriend, a disreputable attorney.

The commissioner of cultural affairs is arrested for the murder of a controversial artist, but Stone and Robinette suspect an art patron also is involved.

An opportunistic congressman makes a media circus out of an alleged rape of a black girl by white cops.

A two-faced anti-abortion advocate becomes a martyr when she is killed in the bombing of a clinic. Guest star: Caroline Kava.

A cop's body is thrown out a window as Greevey and Logan enter a tenement to arrest an ex-convict for murder.

A celebrated local TV news reporter is gang-raped under puzzling circumstances, and prosecution of the defendants is hindered by a lack of concrete evidence.

Part 1 of 2. Stone prosecutes three men associated with an organized crime family when they attack a Russian immigrant.

Part 2 of 2. When a bribery charge brings a member of an organized crime family back to court, Stone brings the head of the family to justice.

Greevey and Logan's investigation of the shooting of two innocent children leads to a 14-year-old gunman and the people who hired him.

The detectives' probe of a felon's murder is hobbled by a cover-up to protect the killer; Stone has evidence to convict but faces a tough court opponent.

While Stone and Robinette believe they have an airtight murder case, Greevey and Logan dig deeper and find the victim's partner involved in a frame-up.

The detectives investigate the murder of a Lebanese drug smuggler who was killed while being transported to a courthouse in federal custody.

Stone prosecutes a man who employed extreme methods to find a desperately needed kidney for his daughter's transplant.

Capt. Cragen is implicated in an internal police scandal, and Stone reluctantly prosecutes him on bribery and corruption charges.