Dateline: Unforgettable

When Jen Ramsaran disappeared, police searched online for clues and wondered if she escaped the real world for a fantasy world; journalist Andrea Canning covered the case in one of her first assignments for "Dateline."

After a young Army veteran disappeared, detectives uncovered a cryptic 911 call placed 11 days before she went missing, which exposed a twisted story -- and the truth; reporter Josh Mankiewicz recalls the case.

Andrea Canning recalls the twists and turns in the case of Beverly Carter, a top-selling realtor who went missing after showing a house -- when her friends received mysterious text messages, they knew something was wrong.

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.

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

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

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 a case fueled by a rage so hot, it is seared into her memory; the battle between a wife and a mistress for one man's heart led down a deadly path, to a showdown on the highway.

A case that reveals an ugly secret about life in the military and one Andrea Canning will not forget; when soldier Vanessa Guillen vanishes from Fort Hood, her family brings attention to her disappearance and revelations inspire a movement.

Aaron Fraser was 3-years-old when his mom disappeared. Authorities believed that he witnessed her murder, yet the truth stayed buried. Haunted by the memory for more than two decades, Aaron eventually made a discovery that unlocked the mystery.

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.

Against all odds, a young woman survives a brutal attack on her and a friend in a park, and while DNA points one way, a bombshell message points another.

Keith Morrison looks back on this haunting mystery he reported on for more than 10 years. A pilot flees following a plane crash, becomes a fugitive and lives a double life for decades.

A couple who made a fortune in gold was headed for divorce when the wife was murdered. How she was killed made this case unforgettable for Josh Mankiewicz. A video that seemed to provide an alibi ended up pointing police to the killer.

It's a chilling story unlike anything Dennis Murphy has seen before, or since. A beautiful college student goes missing from her off-campus job. A week later, investigators receive a mysterious phone call that changes everything.

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.

Josh Mankiewicz wanted to return to this case because the very thing Christina Morris feared most became her living nightmare. She went out with friends and vanished. Police questioned everyone, hoping the truth would lead them to her body.

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.

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

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.

When a college student is found dead after a party, his mother is determined to find out what happened. What follows is one of Dennis Murphy’s most memorable stories, as this tenacious mom fights to get her son’s case in front of a jury.

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 a look at the interrogation and the circumstances that could lead to a false confession.

A case Andrea Canning will never forget as 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.

Josh Mankiewicz returns to a case with a twist no one saw coming. A popular teacher was killed in her home. There was an arrest, a trial, and a verdict. Then came the bombshell that gave a convicted murderer his chance at freedom.

A beloved couple was found murdered among a lifetime of valuable collectibles in their home, a case Dennis Murphy wanted to look back on. Investigators wanted to know if there was a connection between the memorabilia and the murder.