Dateline NBC - Season 23 / Year 2015

Stacey Schoeck, the Snellville, Georgia, wife and mother who hired a hit man to kill her husband on Valentine's Day

When 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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Cathy Torrez was a beautiful, smart and responsible 20-year-old student. So why didn't she come home after work like she was supposed to?

An arrest is finally made five years after a mother of four disappeared while she was close to her apartment in Montana.

Authorities take two years and three trials to solve the shooting death of the wife of an FBI agent in the kitchen of her family's Virginia home.

When a woman returns two days after being reported abducted, authorities believe it's a hoax until a similar crime forces them to take another look; twenty-seven women who have accused Bill Cosby of assault get together to share their stories.

Daniel Villegas, 16, confesses to a double murder in El Paso, Texas, and is sentenced to life in prison. When a local businessman hears of the case 10 years later, his investigation leads him to believe the teen was coerced into a confession and wrongfully convicted.

The case of Johnny Hincapie, whose conviction for the 1990 murder of a Utah tourist in New York -- a case that represented a tipping point in the city's law enforcement -- was overturned after 25 years; a 29-year-old woman goes missing.

Natalie Morales speaks to the mother of the teenage sexual assault victim from St. Paul's School; new details from both sides of the case, Owen Labrie's conviction and sentencing, and interviews with Labrie's friends and legal team.

Natalie Morales speaks to the mother of the teenage sexual assault victim from St. Paul's School; new details from both sides of the case, Owen Labrie's conviction and sentencing, and interviews with Labrie's friends and legal team.

When detectives track down the killer of a Las Vegas cocktail waitress and mother, it becomes clear that the investigation has just begun.

Full coverage of the series of shootings and bombings across Paris

A model with a checkered past goes under cover to reveal the truth about a cold case involving a romantic getaway on a boat that ended with a woman being lost at sea.

The five-year investigation into the death of a retired corrections officer, who was killed by antifreeze poisoning, reveals multiple suspects.

The five-year investigation into the death of a retired corrections officer, who was killed by antifreeze poisoning, reveals multiple suspects.