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Season premiere - When a woman is strangled to death in her upscale Texas home, police look at the men in the victim’s life, while also considering that a stranger may have killed her. Keith Morrison reports .

A man who was recently acquitted of the murder of his ex-girlfriend's 12-year-old son tells his story; interview with the victim's mother and key players in the case.

A daughter's determination to learn more about her mother's mysterious death leads to the reopening of a 30-year-old cold case. Dennis Murphy reports.

The investigation into the death of Spokane, Wash., businessman exposes a web of malevolence extending from the Pacific Northwest to a North Dakota oil field. Keith Morrison reports.

A son uncovers a dark family conspiracy when he questions his mother following a man's apparent suicide. Keith Morrison reports.

A Jacksonville, Fla., firefighter discovers a disturbingly violent scene in his darkened bedroom on a Halloween weekend. Andrea Canning reports.

Police initially suspect natural causes as they investigate a man's death, until they learn about an unconventional love triangle, which points the investigation in a new direction. Andrea Canning reports.

After seeing a report on the murder of college student Michelle O'Keefe, a son asks his father for help looking into the case. Keith Morrison reports.

After a man's conviction for murdering his wife is overturned, new allegations take the tale in an unexpected direction. Keith Morrison reports.

On June 28, 2014, 19-year old Marine wife Erin Corwin tells her husband she is going out to scout hiking trails in Joshua Tree National Park. She then vanishes without a trace. Andrea Canning reports.

When a woman is found dead in her garage, detectives in Frisco, Texas uncover a series of suspects – all of them connected in different ways to her secretive life. Josh Mankiewicz reports.

Keith Morrison on the final chapter of Cal Harris' journey through the courts in upstate New York. Dennis Murphy interviews Dalia Dippolito whose second trial took a stunning twist in Florida.

Dalia Dippolito, accused of hiring a hitman to kill her husband, goes on trial for the third time. Dennis Murphy reports on the mesmerizing story of an undercover police sting.

Donald Trump is inaugurated President of the United States in Washington, DC. Plus, A Virginia man learns that his wife and son have been kidnapped while on vacation in the Philippines by an Islamic militant group. The man soon receives a call demanding $10 million in ransom. Dennis Murphy reports.

After Ross Harris left his 22-month old son in a hot car for hours, it sparked a murder investigation and an explosive trial. Andrea Canning reports with an interview with Ross Harris' cousin.

A recent high school graduate is miraculously found alive after she and her friend are brutally attacked. Who could have committed such a horrific attack? Josh Mankiewicz reports.

A private investigator searches for answers after two women are murdered five years apart in different states. Is there a connection between these two cold cases? Josh Mankiewicz reports.

A new hour of Dateline details the latest efforts to free Steven A. Avery and Brendan Dassey, featuring rarely seen video and interviews with key players in the case. Andrea Canning reports.

In her first-ever TV interview, Michelle Hadley talks to “Dateline NBC” about spending three months in jail last year, accused of stalking Angela Diaz online and more. Dennis Murphy reports.

Florida, 2009: Quinn Gray, a homemaker, calls her husband Reid and tells her she's kidnapped, she doesn't know where she is and three men want $50,000 to release her. The Grays are wealthy, so Reid has no problem getting the money together quickly. She calls him repeatedly with money drop locations but the directions are so rushed and chaotic that no money is exchanged. Quinn's mom takes over and drops the money in a parking lot. Three random guys pick it up and call 911 so they don't get into trouble. The money drop is a bust. But, as investigators dig and dig, a sighting of a kidnapper on a security camera leads to a bomb blast of a revelation.

When a rising attorney in South Florida is murdered, police investigate whether her death is connected to a web of fraud, betrayal and more than $1 billion in missing money. Dennis Murphy reports.

A large, tight-knit Long Island family go to extraordinary lengths to find their missing sister, Sarah Goode.

A pair of double homicides in Nebraska, five years apart, lead police to fear a serial killer may be on the loose. Josh Mankiewicz reports.

Andrea Canning reports on a case about a former hockey player, who finds his wife murdered inside of their home, but although his daughter claims that she saw a robber, the killer's identity turns out be more complicated than expected. Also, Josh Mankiewicz reports on a 23-year-old woman who vanished from an upscale shopping mall in Plano, Texas.

The investigation into the disappearance of a mother of three in Colorado reveals she was living a double life.

In a new, two-hour Dateline, Dennis Murphy sits down with Michael Peterson in his first network television interview since his release from prison in 2011.

Andrea Canning reports on a young mother found dead on a country road. And Keith Morrison shares the story of a detective’s search for justice that brings her face to face with a serial killer.

Police investigate when a 23-year-old woman goes missing from a shopping mall in Plano, Texas.

A detective promises to get justice for a victim whose body turns up at a trash facility.

A look at the 2004 murder of pregnant California woman Laci Peterson, including previously unseen interrogation footage of her husband, Scott Peterson, who was convicted of the crime.

When Cara Ryan shoots her ex-husband and accuses him of threatening to kill her, police question her motive. This Friday, Ryan speaks out exclusively to Keith Morrison about the outcome of the stunning trial. Keith Morrison reports.

Deep in the Sonoran desert, the mystery surrounding the deaths of three women takes 17 years to untangle, and is only solved when a fourth woman comes forward with the truth. The two people at the center of the case speak out exclusively to Dennis Murphy.

When a mother of three mysteriously disappears, the only clue is her abandoned vehicle on a lonely Montana highway. Josh Mankiewicz reports.

A wealthy Charleston banker and his wife are locked in a bitter divorce. One week before their divorce hearing, authorities find an ex-con in town who confesses he had been hired to kill someone in their family. Who was the mastermind behind the hit? Keith Morrison reports.

After a Virginia man’s wife and son are kidnapped while on vacation in the Philippines, a dangerous group of international terrorists demands millions in ransom. With time running out, the FBI joins the case, which comes to a heart-stopping conclusion. Keith Morrison reports.

When shots ring out at a home in Saco, Maine, Rachel Owens is found shot in the head. Police launch a complex investigation that involves three states, all holding pieces to the puzzle. Andrea Canning reports. Dennis Murphy reports.

A young woman's body is discovered in the basement of her home in western Massachusetts. What could explain the horror that greeted first responders?

In the early morning dark in San Antonio, Texas, a husband shot his wife, saying he mistook her for an intruder. Was this a terrible accident or a case of deliberate murder? Andrea Canning reports.

A young woman is shot in her home just outside Salt Lake City, Utah. Was it an accident? Or something far more sinister? Josh Mankiewicz reports.

A woman continues searching for answers after the investigation into her daughter's murder goes cold. Keith Morrison reports.

For the third time in a year, a fire in Bergen County, New Jersey is used to cover a murderer's tracks. Is this latest murder the work of a serial killer or is it personal? Andrea Canning reports.

When a fire is set to cover a murderer's tracks in Bergen County, N.J., for the third time in a year, authorities suspect a serial killer may be on the loose.

The battle between a wife and a mistress for one man's heart leads to a deadly car chase.

An unexpected revelation may change the fate of the man convicted in the case of a young woman found dead in the Kentucky warehouse where she worked.

Keith Morrison reports on the mind and myth of Charles Manson. The one-hour special features rarely-seen video of Manson and interviews with his former parole officer and a “Manson Family” confidant. Morrison also speaks with key players in the case including: Gregg Jakobson, former music producer; Barbara Hoyt, former Manson family member; Debra Tate, victim Sharon Tate’s sister; Anthony DiMaria, victim Jay Sebring’s nephew; Virginia Graham, key witness for the prosecution; and Manson expert and author Jeff Guinn.

Amanda Lindhout reveals personal details about surviving her kidnapping in Somalia and her rescue.

Kate Snow speaks with two families about their unforgettable stories of surviving the 2013 Westgate Mall terrorist attack in Kenya.

A luxury car salesman receives a visit from a beautiful client. It turns out she is not interested in buying a car but in planning a murder. Andrea Canning reports on her twisted scheme.

When film executive Gavin Smith vanishes, Los Angeles detectives search for clues amid reported sightings and suspicious circumstances. The case takes a dramatic turn when Gavin’s wife reveals painful secrets. Keith Morrison reports.

After a father goes missing, his body is found in a field several miles away. Investigators start putting the pieces together and uncover multiple suspects – even within his own family. Andrea Canning reports.