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.

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.

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.

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.

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.

A couple takes a scuba-diving trip to the British Virgin Islands. On their last dive, one of them surfaces but the other does not. Police quickly suspect the drowning was no accident. Now Dennis Murphy gives this unforgettable story a second look.

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.

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.

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.

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.

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.

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.

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.

A Florida father is determined to find out what happened to his daughter after her fatal fall from a penthouse apartment; Dennis Murphy revisits the dramatic events as this dad confronts overwhelming obstacles to learn the truth.

When three people are found dead on the same day in a Kentucky town, investigators know that it isn't a coincidence; years pass before an arrest; Keith Morrison reflects on the triple murder that shook a tight-knit community to its core.

The fatal shooting of NBA star and hometown hero Lorenzen Wright sends shockwaves through the city of Memphis, TN; Andrea Canning takes a new look at the diabolical plot behind Wright's murder and his family's tireless fight for justice.

The murder of 19-year-old Alaska Native Sonya Ivanoff jolts the small coastal city of Nome, Alaska; the story sends Josh Mankiewicz to the most remote place he's ever been for "Dateline."

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 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 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 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.

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.

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.