The investigation into the death of a pregnant woman just months after she wed her high school sweetheart reveals secret lives and feuds.

20 years after an attractive young nurse was murdered in her studio apartment, authorities try to piece together what little evidence that remains to solve the cold case, including a necklace that was broken and a strange murder weapon. Keith Morrison reports.

When a well-known woman from a prominent family is found dead in her Aspen, Colo. home, the entire community is left in a state of shock, leaving the authorities wondering who was behind her apparent murder and why they did it. Keith Morrison reports.

While away on business in California, Frank Howard, a high flying accountant from Carrollton, Texas, learns that his wife has been brutally attacked in their home.

A cryptic 911 call made days before a young Army veteran disappears helps detectives uncover the truth, exposing a twisted story of unrequited love Josh Mankiewicz reports..

When young mother and wife from upstate New York mysteriously vanishes, the authorities on the case find some unexpected secrets that leave them wondering if her disappearance is related to her online life, or something much closer.

When two women from the same church are the victims of violent crimes one year apart, the authorities try to determine if there is a connection, and a photo surfaces that leads them to believe the similarities between the case are not coincidental. Keith Morrison reports.

The community of Jonesboro, Arkansas is stunned when a local father and real estate investor is found dead in his own kitchen, leaving the authorities on the case wonder who could have possibly been behind the young man's murder.

When a wife and mother is found dead in a Kentucky warehouse where she worked, detectives soon zero in on one person of interest.

A well known lawyer from a southern town is found brutally murdered, with his girlfriend bound by duct tape, and as the authorities put together a list of potential leads, the primary suspect has a surprising connection to the victim. Andrea Canning reports.

A newly married couple both manage to recover from the same strange illness, but months later, the wife ends up passing away after showing the same symptoms again, leaving the investigators without answers, until some old recordings surface. Dennis Murphy reports.

The murder of 18-year-old Alexandra Kogut by her boyfriend at SUNY College at Brockport

Authorities in the Pacific Northwest investigate the disappearance of a young mother.

When a loving mother is found brutally stabbed to death, police quickly determine who held the knife. But was it part of a cold-blooded conspiracy?

Police suspect a serial killer when two women and their teenage daughters are murdered. Dennis Murphy reports.

A woman seeks the truth when her whirlwind romance turns into a mystery involving government agents.

The dead body of a young college student from Wisconsin is discovered near her parents' home, but as the authorities searched for clues, the evidence leads them to her theatre group, where they uncover a whole new crime that reveals the truth. Andrea Canning reports.

A witness comes forward to help solve a 20 year-old cold case involving a woman who mysteriously vanished in Florida just days before she was going to move to a new city with her 5 year-old son, leaving behind very few clues for authorities. Dennis Murphy reports.

The story of a successful realtor who was attacked and left for dead while showing a home in what looks like a murder-for-hire, and the authorities are left to question his business partners and family to determine a motive. Josh Mankiewicz reports.

A small Texas town is left in shock when an admired prosecutor is killed in front of the town courthouse, but when the District attorney and his wife are murdered months later, the authorities quickly realize that the two cases are connected. Andrea Canning reports.

Six survivors of the 2012 Costa Concordia shipwreck share their stories.

The suspected killer of a California housewife claims it was a burglary gone awry.

A look through the eyes of more than a dozen survivors of California's largest wildfire.

The poisoning death of former Russian spy and businessman Alexander Litvinenko, traveling to London, Moscow and Rome to take a closer look at the circumstances surrounding his murder and the people that are involved.

An art student from Dallas who was murdered in her own bed with no signs of forced entry, which leads the authorities to realize that she likely knew the person who ended up killing her. Keith Morrison reports.

Survivors of the 2004 tsunami that hit Thailand -- including Petra Nemcova -- share their stories.

Murder case involving New York real estate heir Robert Durst, including interviews with the detectives and investigators, as well as close friends, as he outlines the lengthy journey to uncover the truth.

When an attractive young mother is murdered in California by four men, the authorities uncover information that forces them to take another look at a puzzling case from decades earlier involving the death of a young woman on a Georgia mountain trail. Keith Morrison reports.

Keith Morrison reports on John McAfee, the antivirus pioneer who remains a person of interest to police in their investigation into the murder of Gregory Faull in Belize. In a new interview with Dateline, McAfee discusses his new computer security business and his decision to stop running and settle down.

When an accomplished young doctor is rushed to the hospital after collapsing in her home, her friends and co-workers are left perplexed, but when it turns out the cause was cyanide poisoning, the authorities begin a criminal investigation. Dennis Murphy reports.

A popular kindergarten teacher and mother makes a lifestyle change, losing several hundred pounds, but when mysteriously vanishes from her home, the police suspect her dramatic weight loss could be connected to her disappearance. Keith Morrison reports.

Natalie Morales sits down with Hollywood power couple, producers Mark Burnett and his wife Roma Downey, for an in-depth interview about their highly anticipated television event, NBC’s “A.D. The Bible Continues.” Following the enormous success of their first miniseries, “The Bible,” Burnett and Downey are at the forefront of a wave of religious programming taking the country by storm. Dateline takes viewers behind the scenes during the filming of the new 12-part series in Morocco, interviews cast members about their experience portraying prominent Biblical characters, and follows Downey and Burnett on their promotional tour at mega churches across the U.S

An inside look at what it's like to live with autism as a young adult, chronicling the lives of two people who live with the disorder as they transition into adulthood after graduating and subsequently "age out" of their structured support system. Andrea Canning reports.

The authorities are left searching for answers while investigating a Georgia couple's private Valentine's Day getaway that turned deadly, but plot thickens when they uncover evidence of tire treads at the scene and a series of cell phone calls. Keith Morrison reports.

A love triangle is uncovered after a doctor ingests a lethal chemical.

A car belonging to a missing man erupts in a blaze, leading to clues regarding his whereabouts.

After a mother is murdered in her own bed, the 911 dispatch center fields two calls, one from her son and one from her husband, both of whom claim the other is the killer, telling wildly different stories that the authorities must figure out. Dennis Murphy reports.

Questions surround a young father when his wife perishes in a house fire and a second tragedy takes his son's life. The Arson Investigator on the case speaks out to Dateline for the first time.

Pink Panthers, a gang of jewel thieves who are responsible for a series of high profile robberies around the globe, fooling the world's most experienced detectives. Dateline reports on the new generation of these violent criminals, who continue to shock the world with their brazen and disturbing heists.

When the head of a well known Texas dynasty passes, the once close family comes apart at the seams amidst accusations of distrust, betrayal and greed.

The vanishing of a 20-year-old honors student is investigated in a mystery that would take more than 20 years to solve. Josh Mankiewicz reports

German foreign exchange student and soccer player Diren Dede's dreams of studying in America came true when he began his junior year at a Montana high school. But when he decides to play a reckless teenage game, the consequences turn deadly. Josh Mankiewicz reports.

Two sisters, who once belonged to a traveling commune, share horrifying stories of lies, greed and lust from the time that they were involved with the group, which was investigated for a period of over ten years for their mysterious deaths. Dennis Murphy reports.

A foreign exchange student and soccer player's participation in a dangerous game leads to deadly consequences.

Authorities try to solve a thirty year old cold case involving a young nurse who was found murdered in her small apartment, where the only evidence the investigators could find was a strange weapon, a broken necklace, and not much else. Keith Morrison reports.

When a Georgia mother is killed during a home invasion, and the next night her best friend and neighbor is the victim of a shooting just outside of where they both worked, the authorities quickly find evidence that the two crimes are connected. Dennis Murphy reports.

A determined investigator from Orange County tries to solve a case involving Patricia Esparza, a woman hiding a 20-year-old secret, and who in that time managed to pull herself out of poverty, get an education, and become a respected professor.

Police find very little evidence, fingerprints or other useful information when they investigate the murder of a popular college student who was gunned down inside of her own car, but they soon get an unexpected lead from a surprising source.

When a successful businesswoman is found dead in her own home, the authorities find little in the way of forensic evidence, but wiretaps and data analysis provide them with a lead when a seemingly untraceable call points them to a familiar person. Josh Mankiewicz reports.

When a single mother of three goes missing, her family and the authorities organize a huge search, but as the investigation continues, the police learn that she was living a double life that points them toward several dangerous suspects. Keith Morrison reports.

In 2006, 27-year-old Justine Abshire, a beloved teacher in a small Virginia town, dies as a result of an apparent hit-and-run by a mysterious stranger...until investigators start learning more about her and her husband Eric's relationship.

When a 33-year-old Catholic high school tutor from Michigan uses an unbelievable defense in court after being charged with having an illegal relationship with a 15-year-old, the ensuing courtroom battle becomes extremely emotionally charged. Keith Morrison reports

Three mothers from Virginia band together to pursue an unconventional treatment for their desperately ill children.

My Kid Would Never Do That: Stranger Danger Hidden cameras capture the choices that children make when they are approached by an actor playing the part of a family contractor; Safely Ever After's Pattie Fitzgerald shows families how to prevent their children from becoming victims.

Summer is all about baseball games, laying out by the pool, barbecues in the sun. But there are a handful of kids who won't enjoy these activities this season, or at any time of the year.

Two friends of a woman who appears to die in an accidental fall in the shower spend more than two years seeking justice on her behalf. Andrea Canning reports.

Correspondent Keith Morrison reports on the death of a terminally ill woman, whose husband returned to their house in St. Louis and found her dead on the living room floor, as new information comes to light and complicates the seemingly-simple case.

Correspondent Josh Mankiewicz reports on the death of a wealthy luxury car dealer, who was found murdered in his sleep, as one chance clue reopens the cold case and enables detectives to dig further into his past with one of his many lovers.

The Madison climbers know that Mount Everest is as dangerous to adventurers as it is alluring. But as the group prepares to set out, they have no idea that their journey up the mountain will take a deadly turn. Richard Engel reports.

The parents of teenagers get the hidden cameras turned back on them to see how they will react to a scenario involving bullying; "Queen Bees and Wannabes" author Rosalind Wiseman shares her advice on how to handle bullying and cliques.

When a woman kills the man she suspected to have been behind the murder of her husband a month earlier, she claims that she was acting in self-defense, but when new evidence comes to light years later, investigators decide to re-open the case. Keith Morrison reports.

An intelligent young woman who overcame an upbringing in poverty to become a successful criminal defense attorney in Baton Rouge, Louisiana is found dead in her office, leaving authorities wondering if one of her clients was behind her murder. Dennis Murphy reports.

Authorities in Baltimore find a young woman who was murdered in her own home, but they cannot crack the case until a decade later, when DNA evidence provides them with a new suspect, giving two detectives renewed vigor to solve the cold case. Dennis Murphy reports.

After losing a hard-fought custody battle, a mother vanishes with her nearly one-year-old daughter, forcing the father to embark on a desperate, two decade search for his child across four continents, making international headlines along the way. Andrea Canning reports.

When Tom Foley becomes the top suspect in his wife's murder, he spends the next two years trying to prove his innocence.

When Amber Dubois vanished in San Diego County, a search turned up nothing. Then, a year later, Chelsea King disappeared in a neighboring town. Keith Morrison reports on the mystery of the missing California teens

A home in a small Iowa town is disturbed in the middle of the night by an intruder. Keith Morrison reports.

Joyce Mitchell comes to work at a prison tailor shop and meets two inmates -- David Sweat and Richard Matt -- serving life for murder.