20/20 - Season 21 / Year 2023

The investigation into a Texas murder reveals the killer may have been watching all along.

The latest reporting on the investigation, exclusive interviews and chilling new details in the Idaho case.

A hockey player, a brutal murder and a shocking witness – the victim's young daughter.

Did a mom found dead in a luxury apartment slip and fall, or was it something more sinister?

Was it a case of self-defense or murder after a mom of two shot and killed her partner?

Affairs. Antifreeze. A letter from the grave. What really happened to Julie Jensen?

After a mother and daughter are murdered, investigators encounter a self-proclaimed vampire and taunting letters from a killer.

An Instagram model's relationship with an older man turns deadly, and a witness provides a shocking account of the fatal day.

Breaking coverage and exclusive analysis after a jury found former South Carolina attorney Alex Murdaugh guilty of murdering his wife and son.

A man wakes up to find his fiancée dead; a shocking confession changes everything.

How a North Dakota love triangle ended with murder and a house in flame.

A college student, Lauren McCluskey, is murdered after being stalked. Did the University fail to protect her?

An open marriage, a secret affair, and a sinister plot for murder.

A devout husband goes from victim to murder suspect; how a wife's secret recording changes everything.

As environmental crises cause a Las Vegas reservoir to recede, a trail of bodies from decades past is revealed.

A clown murders a Florida mom, leading to a 30-year journey to solve the case.

A love triangle involving a divorced mother and two wealthy doctors ends in a successful murder-for-hire plot.

A serial killer works as an FBI informant while concealing horrific crimes.

The courageous journeys of families and survivors following the tragedy at an elementary school in Uvalde, Texas.

After a popular local musician is found dead, covert police surveillance uncovers horrific murders in Colorado and exposes a killer.

A twisted couple's bizarre marriage pact, and how one of them was brought to justice by a small-town police chief.

The notorious disappearance of Kristin Smart, whose killer was finally brought to justice after a decades-long investigation.

The dramatic twists and turns in the more than decadelong investigation into the Gilgo Beach murders.

After a teen vanishes, her family searches for answers but police see a suspect closer to home.

A 12-year-old is kidnapped during a sleepover with her friends; authorities launch a cutting-edge investigation to find her.

The stunning case of an illicit affair, manipulation and murder.

An inmate and corrections officer vanish. Was it a kidnapping – or a forbidden romance?

When a boy is kidnapped riding a bike, parents, police and a blogger work to bring him home.

After a woman vanishes, police uncover her husband's dark past.

A young woman's mysterious disappearance and the search-and-rescue operation that led police to a barn full of dark secrets.

After a young couple is murdered, their true identities lead to a shocking twist about their missing baby.

Reporting on a verdict in the case of a beloved law professor's gruesome murder.

When multiple women are murdered in Texas, police hunt for a serial killer – but is he closer than they think?

The murder of a beloved mom sparks an international manhunt; police uncover clues in an accused killer's diary.

A former NFL player and his wife are murdered in Texas and the shocking evidence in their son's third murder trial.