An illicit love triangle, a wife with a double life, and one big lie lead to murder.

When an inmate and corrections officer vanish, authorities question whether it's a kidnapping or a forbidden romance.

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

When a woman vanishes, police uncover her husband's dark past; the missing woman's own past comes under scrutiny.

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.

A star cyclist is gunned down by a friend’s jealous girlfriend, and the international chase to find the suspect.

A North Dakota student is abducted after shopping at the mall; inside the hunt to catch a killer before he kills again.

When a woman is found murdered, a written confession gives insight into the mind of her killer.

Gypsy-Rose Blanchard's story of murder, family, romance, deception and abuse; her first interview after her release from prison.

An attempted kidnapping leads police to a killer.

Conspiracy, escorts, and murder-for-hire. An exclusive inside look at the undercover investigation.

A U.S. Army Sergeant is murdered; investigators uncover a heartless plot of adultery and greed.

A mysterious brutal murder and the bizarre home renovation that may have been the motive.

A Florida university campus is on edge when a student disappears. Police say love, lies and obsession led to murder.

When four young women go missing, police hunt for a serial killer roaming the interstate. John Quiñones takes us into the families’ quests for answers.

Ruby Franke, a popular YouTuber, sees her world implode after her emaciated son escapes.

When a young couple is found dead, police learn they were involved in an online feud and uncover a deadly catfishing scheme.

A teen girl vanishes after getting into an unknown vehicle. When the truth of her disappearance comes to light, the community is shocked by who is behind the violent plot.

After a small-town minister is killed at home, police uncover the dark truth of his marriage.

When a young mom goes missing, police question a pastor, the ex-husband, and even a local ventriloquist. But authorities are left wondering – who would want to harm Tricia Todd?

When two teen girls never make it home after a night out, police discover their dead bodies in the trunk of a car. Decades pass before detectives zero in on an unlikely suspect.

When a beloved celebrity hairstylist is found murdered in his own home, was it a burglary gone wrong – or something more sinister?

New developments in the case of a 20-year-old nursing student who disappeared from her Tennessee home.

After serving three decades in prison for his wife's 1987 murder, 20/20 documents a man's fight for freedom.

A new interview with Keith Papini after his ex-wife Sherri Papini served time in prison for her false kidnapping tale and mail fraud.

A couple is murdered inside their home, possibly by someone trying to hide a secret double life.

Karen Read answers questions surrounding the night at issue in her controversial trial.

The former ballerina who shot and killed her husband tells her story, in a 20/20 exclusive.