It is a case Josh Mankiewicz cannot forget because, while a student-athlete did everything right to keep herself safe, others did not; after she was found murdered, investigators learned she reached out for help multiple times before her death.

The case involved detective work so unique, it managed to stay with Dennis Murphy for years; days before Christmas, Michelle Martinko was visiting the mall when she was found stabbed to death; investigators found her killer almost 40 years later.

Andrea Canning reflects on this cautionary tale that still inspires her today. A man steals millions of dollars conning women and businesses over 25 years. One woman brings together a group of his victims to hold him accountable and face justice.

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

A man with both power and prestige managed to fool everyone, right up until his arrest.

Josh Mankiewicz returns to a case that took six years to report. A woman is found murdered after her friend hears her screaming on the phone. The case sits cold until the mysterious death of her boyfriend’s twin brother leads police to a suspect.

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.

Keith Morrison recalls how a deadly high-speed chase in Montana led to a mystery, where a missionary turned into a monster and committed one of the state's most notorious crimes.

Andrea Canning reflects on a story that reminded her how people can be vulernable and how quickly life can change; she speaks with Judge Esther Salas about the knock at her door that robbed her of the most important thing in her life

Keith Morrison won't soon forget a frantic three days in 2016, when a woman's disappearance in Oregon set off an intense manhunt. The suspect's 60-hour crime spree included carjacking, abduction and murder.

A case with a plot so diabolical, Dennis Murphy had to revisit. Venus Stewart stepped outside her door and vanished. Investigators suspected her ex, but he had an alibi. Then a video gamer’s tale had detectives seeing double and exposed the truth.

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.

A mother and son die in a house fire. A man confesses to their murders, but later says he was coerced. Keith Morrison returns to the case for an extraordinary look at the interrogation and the circumstances that could lead to a false confession.

A case Andrea Canning will never forget, because it revealed an unbelievable blind spot in law enforcement. Reagan Tokes worked a late shift at a local restaurant, then went missing. What happened to Reagan left her family and a city outraged.

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

When Josh Mankiewicz gets asked about his most memorable stories, the name Dayna Herroz comes to mind; after her daughter and 10-month-old grandson are murdered, her quest for justice ends with a twist in a San Diego courtroom.

Andrea Canning reflects on a story that hits close to home for her because of where it takes place. A coroner arrives at the scene of a car accident to find his friend deceased and begins to think her death looks suspicious

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

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.

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.