Andrea Canning recalls a case in which investigators set up an elaborate sting operation to stop a murder-for-hire plot.

A college student is found murdered and the case sits cold for nearly 40 years. Josh Mankiewicz reflects on the vow that keeps the case alive and the innovative method used to catch the killer.

A couple is murdered shortly after their wedding and police suspect a family feud is the cause; Josh Mankiewicz looks back at what started the dispute that left him floored.

Investigators track down a suspect in the disappearance of a celebrity dog trainer. Keith Morrison reflects on the fractured love story at the center of this mystery.

Gary Hilton is a name Dennis Murphy will always remember. A hiker goes missing and authorities suspect Hilton is reenacting a slasher movie. Dennis reflects on the real-life murder spree that terrorized the American South.

When a novelist's wife is found dead at the bottom of the stairs, investigators wonder if it is an accident or murder; Dennis Murphy interviews main suspect Michael Peterson and returns to the case with insight only he can share.

Andrea Canning looks back on one of her most memorable cases where a fitness tracker helped detectives solve the mystery of a young woman's death in Wisconsin. Andrea confronts the killer in a tense interview.

For a group of stage actors, life seemed to be imitating art in the worst way when a college student was killed.

A case Keith Morrison can't forget in which a teen's murder shakes a Nevada community and two unlikely people confess.

A California woman's two former husbands are mysteriously murdered nearly 20 years apart. Keith Morrison reflects on the case that sent him halfway across the world on a hunt for answers.

For Keith Morrison, this case stands out as an unusual mystery. The crime seemed arbitrary with no apparent motive. There was a confession which might have ended the investigation, but that was only the beginning.

The children of an Oklahoma pastor survive the robbery that took their parents' lives; it's a story Keith Morrison still can't forget, and one where the very best and worst of humanity are both on full display.

They were two beautiful families living out their dreams, but gunshots in a parking lot revealed an ugly truth. Detectives uncovered three lives tangled in a love triangle. Keith Morrison finds the tale of deceit and betrayal unforgettable.

Andrea Canning looks back on the royal who has fascinated her since childhood, Princess Diana. She explores Diana's real story, including a look at her troubled marriage, turbulent life and the investigation into her death.

When a complicated Texas love triangle ends in murder, a pink gun leads to an arrest. New evidence makes investigators rethink the case. Josh Mankiewicz has reported on two-timing before, but this case had a twist he has never seen.

When a small-town Alabama resident is murdered, rumors involving a local pastor begin to swirl. Andrea Canning reflects on this story that feels to her like a steamy soap opera playing out in real life.

Dennis Murphy reported on the twists and turns of the Jennifer Dulos case as they happened. He offers candid insight into his one-on-one interview with the prime suspect: Jennifer’s ex-husband, Fotis Dulos.

A man claims his wife died by suicide, but a suspicious house fire 24 years later raises doubts; Josh Mankiewicz remembers the suspect who could not stop talking.

Keith Morrison revisits a story that has haunted him for years; when detectives find a missing woman's car abandoned on a bridge, their investigation uncovers a tangled plot involving money, friendship, and a deadly betrayal.

Nathan and Denise Leuthold built their family on faith, but suddenly one of them was dead and the other was under suspicion. It's a story that stays with Andrea Canning, both because of what happened and when it happened: Valentine's Day.

When a popular graduate student is shot dead in Durham, NC, detectives uncover a deadly love triangle; it takes a lot to surprise correspondent Josh Mankiewicz, but the claims are shocking.

After a young woman's body is discovered at a trash facility, a detective promises justice and comes face-to-face with a serial killer; Keith Morrison revisits the case.

After filming wraps up on an indie horror movie, the cast members learn that their lead actress is not who she says she is and has been charged with killing her uncle.

When a police officer's wife is shot to death in her bed, her parents' certainty that investigators have it wrong and their determination to untangle the mystery, makes the case unforgettable for Josh Mankiewicz.

This case has stayed with Dennis Murphy since he first reported on it: A determined young woman searches for answers in her mother’s mysterious death. Her decades-long quest leads to a dramatic courtroom decision.