Dateline: Unforgettable

After a nurse and mother-of-three is murdered inside her Illinois home, investigators uncover security camera footage that could be key to solving the case.

A young Tennessee woman vanishes and misses her family's Thanksgiving dinner. Determined to track her down, her family takes matters into their own hands.

A former ballerina shoots her husband in what she alleges was an act of self-defense. The ensuing investigation and dramatic trial spark protests and receives national attention.

After a woman is murdered, a secret is exposed but a mystery still looms. Andrea Canning re-examines the story she first covered years ago. New developments lead to an unexpected conclusion in an interview you have to see to believe.

After a mother is found murdered in her Virginia home, her son embarks on a 20-year quest for justice. For Josh Mankiewicz, this cold case was one of the strangest he's ever covered. He looks back at the reasons why.

An apparent home invasion in Minnesota leaves Heidi Firkus dead and her husband hospitalized. For Blayne Alexander, getting to know Heidi through loved ones was a privilege; for investigators, learning about Heidi helps solve the case.

When Leslie Neulander dies after what seems like an accidental fall in the shower, her book club friends join forces to seek justice on her behalf. Andrea Canning reflects on some of the most determined women she's ever met.

When Britney Ujlaky disappears, a small Nevada town bands together to track down an unknown cowboy.

Keith Morrison takes a fresh look at the case of two missing Idaho children that made national headlines, a story that led him to Hawaii in search of their mother and her new husband.

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.

A hunting safari in Zambia ends in tragedy when a shot rings out from the cabin of a dentist and his wife. Andrea Canning revisits one of the most unique cases she's covered, one that sent her miles from home in search of answers.

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.

After 24-year-old Lisa Zeigert is killed in Agawam, MA, in 1992, her family keeps the case in the public eye for decades and it was featured on the show Unsolved Mysteries; Andrea Canning reflects on the harrowing mystery and discusses the inspiration she's drawn from Lisa's loved ones.

Chris Smith's family receives an email stating that he is leaving California to surf the world; months later, they wonder if he really left. Keith Morrison offers new insights into the case.

When a woman is found dead in her SUV, the investigation into her murder reveals a tangled web of sex and lies. Dennis Murphy looks back on his unusual interview with the lead suspect.

A pastor's secrets come to light, triggering a murder investigation; Josh Mankiewicz looks back at a case that shattered a congregation and exposed the cost of their trust.

When Dr. Joe Sonnier is murdered in Lubbock, TX, the investigation reveals simmering jealousies and a love triangle; Andrea Canning recalls a doctor who dedicated his life to helping others.

A chance encounter on the Pacific Coast Highway with a woman he first spoke to in a jail cell leads Keith Morrison to re-examine the mysterious death of Las Vegas casino magnate Ted Binion.

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.

After Todd Chance is murdered, police follow a trail of video evidence to track down their suspect; Andrea Canning recalls a particularly revealing interview, including an eye-popping detail.

The survivor of a horrible attack is convinced the police on the case have the wrong suspect. Keith Morrison looks back on his heart-wrenching interview with the victim and her courageous quest to uncover the truth.

When Tina Sandoval disappears, her parents and loved ones spend years searching for her; Dennis Murphy takes a fresh look at the secret Tina kept and at the demon who forced her loved ones to make an agonizing decision.

A 911 call reporting an apartment break-in holds the key to solving the mysterious murder of a young graduate student named Katie Sepich; her case contained many twists, and her family's grit still astonishes Josh Mankiewicz.

A mystery in paradise unfolds when Sarm Heslop vanishes from her boyfriend's yacht; in a case that made international headlines, Andrea Canning recounts her memorable journey searching for a particular person of interest.

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.

Newlywed Dalia Dippolito comes home from the gym to find out her husband has been killed; in a case Dennis Murphy will never forget, almost nothing is as it seems; he explores whether Dalia was a pawn in a hoax gone wrong or simply diabolical.

Debbie Kelly and Lars Itzo make their marriage of opposites work; when Debbie is killed, there is no question about who shot her, yet the explanation of why is one of the most confounding Andrea Canning has heard.

A Mediterranean cruise meant to rekindle the love between a woman and her ex-husband leads to her disappearance; the investigation reveals secret recordings and an undercover hitman; Josh Mankiewicz reflects on the cold-blooded crime.

Debra Newell thinks she found Mr. Right, but her daughters sense something wrong about John Meehan; their search for answers exposes a dangerous con man and deceit that runs as deep as any Keith Morrison has covered.

The heir to a legendary hotel is brutally murdered, and detectives learn he had no shortage of enemies; Dennis Murphy takes a fresh look at this extraordinary investigation, a hunt for a killer he calls the most ruthless he's ever seen.

When a Kansas prisoner escapes in a van driven by a volunteer, investigators scramble to track down the pair; Andrea Canning likens this story to a bunch of Hollywood blockbusters rolled into one, but it's as real as it gets.

A woman finds her father, a former FBI agent, murdered at his house; after digging into his past, police suspect the killer might be close to home; for Josh Mankiewicz, the toxic marriage at the heart of this case makes it unforgettable.

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.

When an Iowa woman is attacked while home alone with her three children, the confrontation turns deadly; Dennis Murphy examines one of the most sophisticated criminal plots of his "Dateline" career.

It's a mystery that defies easy answers, and "Dateline" has been following it for more than a decade; Steven Avery and his teenage nephew were convicted of killing Teresa Halbach; now, Andrea Canning shares her insight into the controversial case.

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.

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.

A double homicide in upstate New York leads detectives on a cross-country investigation; Dennis Murphy reflects on a story full of twists and turns, including the surprising suspect at the center.

An advocate for missing and murdered Indigenous women searches for answers in the disappearance of her niece and exposes cracks in law enforcement. Andrea Canning looks back on this important story, one that became her passion project.

For more than 30 years, Ohio investigators have searched for answers in the murder of 10-year-old Amy Mihaljevic; the case details still haunt Josh Mankiewicz and investigators, who ask for help in solving the crime.

Eduardo Valseca is taken hostage in an orchestrated abduction; Keith Morrison reflects on the family he spent years following; what happened to them might have destroyed many, but not the Valsecas.

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.

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.

A mother of two vanishes in Monrovia, CA. As detectives investigate, the woman's loved ones reveal that she feared she was being stalked. For Josh Mankiewicz, cases like these are all too familiar, and that's a tragedy he just can't shake.

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.

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.

After a 15-year-old girl disappears, investigators discover a creek where the local teenagers hang out. Dennis Murphy looks back on the case that kept him guessing until its astonishing conclusion.

Years after a Montana man is found dead, his son searches for answers. Keith Morrison cannot forget that son who opened a box, and faced a terrifying family secret.

When a pastor loses a second wife in an accident, authorities become suspicious. Dennis Murphy returns to this unforgettable story of evil and betrayal, wondering how far this a man of God might have fallen. Dennis still can’t believe the answer.

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.

An aspiring Playboy model is murdered in Miami, FL. A seven second clip of her last moments alive are caught on security video and could hold key clues. The haunting images make this case one of Dennis Murphy's most memorable.

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.

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.

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.

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.

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.

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.

When a star athlete at an Ivy League university goes on trial for murder, sparks fly in the courtroom. The trial ends with a stunning decision that Dennis Murphy will never forget, but the surprises in the case are just beginning.

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 wife calls 911 to report her husband has been shot on a country road in Texas. What she told investigators next makes this case memorable for Josh Mankiewicz.

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.

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.

After shedding hundreds of pounds, a popular kindergarten teacher goes missing. Investigators find a link between her weight loss and her disappearance. The case ranks as having one of the craziest motives Andrea Canning has heard.

A detective makes it her mission to find dozens of women who vanished on the streets of Albuquerque, New Mexico. For Josh Mankiewicz, her resolve makes this story unforgettable.

Keith Morrison reflects on the case of a Chicago woman from a big family who went missing. Investigators began to suspect a man in her life was full of secrets.

A man charged with murder claims it was impossible for him to have committed the crime. For Dennis Murphy, the surprising courtroom strategy provides a memorable twist.

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

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.

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

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.

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.

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 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.

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.

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.

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.

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.

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.

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 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.

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.

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.

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.

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.

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

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

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 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.

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.

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."