48 Hours

In 1969, 17-year-old Mary Kay Hesse was stabbed to death in Wahoo, Neb. – a crime that haunted the community for decades. 48 HOURS first began reporting on the case in 1999, capturing interviews and material that, until now, had never aired. For more than 50 years, the murder remained unsolved. But advances in investigative techniques and renewed focus by law enforcement helped piece together long-overlooked evidence, ultimately leading to an arrest. 48 HOURS correspondent Natalie Morales reports on how the murder of Mary Kay Hesse was finally brought back into focus in "The Girl from Wahoo."

When a college student in Milwaukee vanishes after a first date, investigators race to retrace her final movements. Using data from an app on her phone, law enforcement begins to piece together where she went – and whom she was with. As the investigation focuses on a man named Maxwell Anderson, chilling security camera footage and evidence discovered on a secluded beach raise urgent questions about what happened to Sade Robinson. 48 HOURS correspondent Anne-Marie Green reports in "Sade Robinson and the Secret Beach." 

When a woman's remains found in a swamp outside Savannah are identified, friends are stunned. They had been told Mindi Kassotis died in a hospital. But five months later, authorities say she was murdered. Investigators ultimately focus on her husband, Nick Kassotis, as they work to unravel how she appeared to die twice, and what really happened in the months between. 48 HOURS correspondent Erin Moriarty reports in "The Woman Who Died Twice."

The murder of third grade teacher Jocelyn Peters baffled investigators in St. Louis, Missouri, from the start. The crime scene contained unusual clues, such as potato fragments splattered near the victim, and the behavior of a person of interest before a police interview caught detectives' attention. Why did this man eat pages from a notebook when facing questions about Jocelyn's murder? What did investigators believe the notebook might reveal? 48 HOURS correspondent Anne-Marie Green reports in "Jocelyn Peters and the Notebook."