Dateline NBC

- Season 26

(2017)

A love triangle leads to years of stalking, property destruction, threats, and murder.

When a mother of four, Cory Lovelace, dies unexpectedly on Valentine's Day, her death is attributed to natural causes, but a detective suspects that someone murdered the woman.

When a model and up-and-coming YouTube celebrity turns up dead, police question her husband in the hope he can shed some light on the situation.

Crystal Taylor''s, a murder victim. sisters dedicate themselves to finding the killer, an unsuspected source turns the case upside down.

A community comes together to search for a young woman who goes missing from a Halloween party.

A young father's murder at work leads investigators to deep secrets about sex, friendship, religion and family.

Author Rachel Jeffs talks about life as the daughter of the self-proclaimed prophet of the Fundamentalist Church of Jesus Christ of Latter-Day Saints Warren Jeffs; officials investigate when a woman is found murdered in Fort Worth, Texas.

A young gay woman is found murdered. Was she too hard as a sales manager or was hate a motivation for her killer(s)?

A comprehensive look at the 1989 murders of Jose and Kitty Menendez by their sons, Lyle and Erik; featuring interviews with key players in the case, including Lyle Menendez.

An anonymous letter leads authorities, investigating the poisoning death of a chiropractor, to an unlikely suspect.

A small-business owner and his bride are murdered shortly after their wedding; police suspect a family feud is the cause.

A look at the case of con man John Meehan, including interviews with his wife and her daughter, his ex-wife, Law enforcement offers, and the Los Angeles Times reporter who shined a spotlight on the story.

A couple's anniversary celebration ends in murder, during what appears to have been a home invasion, but investigators believe the suspect might be connected to the victim.

The mysterious death of a young mother in Ohio and the ensuing investigation that spans years and multiple states.

A murder, outside Pleasantville, Iowa, divides a family and forces one man to take the investigation into his own hands.

When a young mother disappears after leaving her infant in the care of her local pastor and his wife, Florida detectives search for her for five years, uncovering a web of secrets and lies.

When a young Army medic, based at Ft. Bragg, N.C., goes missing, police can't solve the case despite having a suspect, until an unorthodox private investigator steps in to help.

A former Marine, who once was the hero for a woman in an abusive marriage, is back on "Dateline." Included: whether his desire to help has gone to far.

A woman's death is initially ruled a suicide, but when a new investigation begins, police begin to suspect murder.

When dozens of homeowners find themselves on a Napa Valley hilltop surrounded by fire, two teams of daring chopper pilots risk their lives, in a mission to rescue them.

When a complicated Texas love triangle ends in murder, a pink gun leads to an arrest, until new evidence prompts investigators to rethink the case.

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At Florida State University Dan Markell is accused of killing his wife.

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This is a recap and follow-up to an earlier episode (Dateline 25.20) dealing with the case of Michelle Hadley who was arrested for sending her ex-husband Ian Diaz and his new wife Angela threatening emails. The case took a twist when the police found evidence that pointed to someone else as the culprit. In this latest episode, it's revealed that the culprit pleaded guilty and was sentenced to 5 years in prison.

A pregnant Tennessee resident is murdered in her bedroom; investigators struggle to find answers.

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The disappearance of a young woman from Bend, Ore., leads to an intense manhunt after the suspect embarks on a two state crime spree.

In a hard-to-believe case, a violent stalker attempts to arrange the death of his ex-girlfriend. He even convinces his new girlfriend that her divorced husband should be added to the list.

After a 15-year old girl goes missing, investigators discover a creek where the local teenagers hang out that may hold the answer to her disappearance.

Rapper Meek Mill interview; exploring controversies surrounding the criminal justice system, including the parole system, wrongful convictions, challenges faced by law enforcement, alleged police abuse and more.

When a young woman is found dead in a field on the outskirts of Green Bay, Wisconsin, a Fitbit helps detectives solve the mystery. Andrea Canning reports.

In a suburb of Toronto, a family lives in fear as one relative after another is found dead, over the years, in the same house;

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A recent law school graduate in Georgia who has a promising future disappears without a trace.

A father in Hawaii tackles setback after setback for over a decade in his fight for justice for his murdered daughter.

A woman from Washington State takes a DNA test, hoping to learn more about her family history. A remarkable discovery would change her family forever.

When a prominent attorney claims to have accidentally shot his wealthy wife, the local prosecutor questions his story.

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A woman whose ex-husband killed six people in Arizona, allegedly targeting individuals with connections to their divorce; interviews with experts on the topics of domestic violence and mass murder.

A husband, convicted of murdering his wife, is granted parole; others fear he may kill again;

An in-depth look at the journalists, who exposed the dangers of cult leader Reverend Jim Jones; interviews with witnesses to murders, carried out by Jones' followers;

A popular high school student is found murdered in her bed; two students help police solve the case.

When two mothers meet, after one of their sons disappears after a college party, their search for answers leads them down an unexpected path;

A beloved former firefighter is found dead in his garage; a neighbor's home security camera may provide answers.

Former actress Catherine Oxenberg shares how she tried to save her daughter from the controversial self-help group NXIVM; interview with cult deprogramming expert Rick Alan Ross.

Stories from the streets of Hollywood, including an interview with producer Jason Blum about how he is revamping the horror genre; Jamie Lee Curtis, Jordan Peele and Octavia Spencer discuss what it is like to work with Blum.

A murder case considered closed by North Dakota detectives is suddenly reopened when a confidential informant comes forward with a tip about an unlikely suspect.

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Four segments: Keith Morrison meets Robin Steinberg, founder of the new non-profit 'The Bail Project' who is taking on the nation's cash bail system; Katy Tur hears allegations of sexual harassment from current and former employees of the U.S. Forest Service; Kate Snow sits down with Hollywood superstar Jamie Foxx, who opens up about what he's learned from his sister with Down syndrome; Craig Melvin talks with basketball coach Lou Adams from Chicago's Orr Academy basketball team.

After being severely beaten in her own home, a high school girl goes under hypnosis to try to identify her attacker.

A Fort Campbell soldier survives 2 tours in Afghanistan but is murdered on the side of the road in a remote location. Detectives test conflicting descriptions of the killer and unravel evolving stories. Time passes and evidence is at risk.

The theme of today's episode is A Deal with the Devil.