Dateline NBC

- Season 23

(2014)

The theme of today's episode is The Charleston Affair.

Dateline goes to Iowa to examine the murder of expecting mother Lisa Techel who was shot to death in her home in May 2012. Police originally suspect a disgruntled neighbor, but investigators soon focus on Lisa's husband Seth after they discover several sexual texts from him to another woman. Prosecutors take him to court and after three trials convict him of murdering his wife.

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Aspen, Colorado: a snow covered playground and safe haven for well-heeled owners and celebrities. That is until one cold February night when a frantic woman calls 9-1-1, barely comprehensible, about a discovery at a secluded chalet overlooking Buttermilk mountain. What happened?

A wife and mother survives an attack in her home and a shot to the head; authorities search for a motive which leads to quite a few surprising twists.

In Santa Ana, California, Maribel Ramos, an ex- private in the army, calls 911 to warn officials that she would be defending herself if anything bad happened to her. Later she turns up dead.

New York, 2012: Jennifer Ramsaran, a wife and mother of three, goes missing. After five days, her van is found with her blood in it. Then she's found in a snow pack. The series of lies and betrayals to get to that point were astounding.

The 2012 murder of Amyjane Brandhagen, of Pendleton, Oregon, and the 2013 near-fatal assault of Karen Lang are profiled. Lukah Chang is charged with both crimes in 2013.

Arkansas, 2011: Marc Despain, a rental property owner, is shot dead in his home. His dad is suspected because there was bad blood between them. But the conspiracy is far more reaching than anyone could imagine.

A payroll director for a medical products company in Kentucky is murdered at her workplace. The list of suspects starts with her husband and ends with co-workers which were there when the murder was reported.

Investigators delve into the relationship between Alex Kogut and her boyfriend, Clayton Whittemore.

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A loving mother is viciously stabbed to death. Is the explanation for the crime as obvious as the blood drenched person walking out of the scene?

Police suspect a serial killer when two women and their daughters are murdered.

New Jersey, 2013: Mischele Lewis, recently divorced, meets Liam Allen on a dating website. After about a year of dating, he asks to marry her and she accepts. She finds out she's pregnant after he proposes. But his mysteries are too much for her to bear before she commits to him. He claims he's a British spy and this creates strange restrictions on the relationship. So she looks through his effects and finds an ID with the name William Allen Jordan on it and Googles this name. To her surprise, she finds he's a common con man. And more.

Wisconsin, 2013: Jessie Blodgett, a high school student, is strangled. Jessie is acting in a show, and had just gone to a cast party, so the cast and crew are interviewed. No one seems guilty until another case has suspicious similarities.

The theme of today's episode is What Lies Beneath.

A Yakima, Washington real estate agent, Vern Hollbrook, is murdered while showing a home.

Investigators seek answers when a prosecutor and a district attorney and his wife are murdered within a couple of months of each other.

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

Violent crimes were nearly unheard of in this California neighborhood, until one morning in November when resident Lynn Schockner is found murdered. Keith Morrison reports

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When a college coed is found dead, police are pulled in multiple directions: a boyfriend, a roommate, and a fellow art student. Who killed Shelley?

A chronicle of the life of Robert Durst and the murders and disappearances he was implicated in.

Dateline examines the death of Rachel Winkler a California mother who was beloved by four men. The investigation into her death reopens a troubling mystery surrounding the untimely death of another woman Catherine Winkler who died on a desolate mountain trail in Georgia.

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When a successful young doctor passes out and is rushed to the hospital, a blood test reveals cyanide poisoning, resulting in a criminal investigation; Dennis Murphy reports.

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A Georgian wife attending a Valentines night rendezvous with her husband finds him shot to death. Tire tracks, cell phone records and an affair point in many directions at many suspects.

Ben Novack Jr., the wealthy heir to Miami's famous Fontainebleau Hotel, is viciously murdered and then mutilated. Financial motive is apparent but who was greedy enough to take action?

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Diane Kyne is found dead in her bedroom, competing stories emerge about which of the two most important men in her life may have killed her. One of the stories must be true - but which one? Dennis Murphy reports

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She controlled the family fortune and now she was missing from her home, the dead body of her caretaker left in the front door.

The disappearance of a 20-year-old honors student is solved decades later.

A foreign exchange student is killed while breaking and entering into a private residence. Was the exchange student a criminal or were the shotgun brandishing homeowners?

When Lou Castro puts together a makeshift family at Angel's Landing, he tells his followers that he is an angel that can see the future; but when a detective starts to investigate the commune, he then uncovers deadly and devastating secrets;

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Tom Brokaw discusses his battle with cancer and his 2015 memoir, "A Lucky Life Interrupted". An intimate look inside Brokaw's family life, including conversations about his diagnosis with his wife and children.

A woman is murdered in a Georgia home invasion. Then her friend and neighbor is shot the following night. Investigators unearth disturbing secrets that suggest the cases may not be a coincidence.

Investigators re-open a 20-year-old murder case after a dark secret comes back to haunt a psychology professor.

The husband becomes the primary suspect when his wife disappears. Then evidence emerges that supports his alibi.

Hidden camera investigations reveal the hope and heartbreak associated with parents desperate to adopt.

In 2014, investigators follow the trail of a virtually untraceable prepaid cell phone call surrounding the death of businesswoman Peggy Nadell.

2007, Grand Junction, Colorado: Divorced, single mom Paige Birgfeld goes missing and her car is found burned but with no one inside. Then her personal belongings are found. After clearing all her ex-husbands, her 'clients' are looked at.

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.

The affair of a 15-year-old student and a 33-year-old teacher creates an emotional courtroom battle.

Three Virginia families, who have children with intractable epilepsy, fight to legalize an oil from marijuana that has shown promise in helping reduce chronic seizures.

Hidden cameras capture children's reactions when they are approached by people they have met once and only briefly. Also, children's reactions to 'stranger danger'.

A New York millionaire, charged with murder in connection with the disappearance of his wife on 9/11/2001, denies all involvement.

A woman suspects poisoning when she finds her husband of five months dead on the bedroom floor with no clue as to what happened.

Profiles the lives of children with rare medical conditions that force them to avoid sunlight and the parents who protect their children from sun, isolation and ridicule.

Hidden cameras capture teenagers' reactions to drinking and nude photos of classmates being shared at a party; a survivor of sexual assault shares her story with teens.

Two friends of a woman who appears to die in an accidental fall in the shower spend more than two years seeking justice for their friend.

Friends of accused murderer Robert Durst talk about his recent arrest in New Orleans and his whereabouts over the past 30 years.

Hidden cameras capture children's reactions to found guns to find the most effective way to educate children about gun safety.

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Missouri, 2011: Russ Faria came home to discover his wife dead and called 911. Russ was initially suspected of being the murderer and told investigators he was at game night when it happened. Despite a solid alibi, a trial went ahead.

When a luxury car dealer is found dead in 2012, detectives suspect one of his lovers. But lack of evidence stalls the case until a superstar detective finds a clue that breaks it wide open.

Climbers affected by an avalanche devastating Mt. Everest base camp due to the April 2015 earthquake that killed more than 8,000 people and destroyed millions of homes.

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When Janepsy Mesa Carballo kills the man she suspects of being involved in an attack that left her husband dead and her young son wounded, she claims self-defense.

Louisiana, 2009: Chiquita Tate rose from poverty to become a successful criminal defense attorney in Baton Rouge. She's found brutally stabbed one night in her office and investigators start scouring her roster of clients. But her killer may be closer to home.

Maryland, 2000: Heidi Bernadzikowski is stabbed. Her boyfriend is ruled out and unknown DNA is discovered on her body. It would take DNA advances during the new millennium to bring about justice.

After losing a hotly contested custody battle, Dorothy Lee Barnett takes her 11-month-old daughter Savanna and disappears. The father searches four continents for almost two decades before reaching an emotional conclusion.

Michigan, 2009: Dar Foley is found by her husband, shot in her own shower. The husband is convicted, but the day after his conviction a witness comes forward and says it wasn't him. Miraculously, he's granted a new trial.

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Iowa, 2014: Justin and Angie Michael have an intruder in their home and Justin is shot to death lying next to Angie. Angie is unharmed. Old-fashioned detective work leads them to a list of suspects.

Tennessee, 2013: Heather Palumbo-Jones, a teacher, goes missing. She recently lost a lot of weight and was enjoying her new svelte lifestyle. Her husband and her ex-boyfriend are interviewed. Who could have done this?