The investigation into Katlyn's death, which was initially reported as a medical emergency after her 4-year-old daughter found her unresponsive. Evidence soon revealed she had been strangled with phone charging cables in what prosecutors called a "cold-blooded and calculated" attack following a recent breakup.

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."