Katherine Heckel, 40, disappeared from Lock Haven, Pennsylvania, on July 15, 1991. She was last seen leaving her job as a management secretary at the International Paper Company for lunch; she called her two children to say she had errands and would eat alone, then drove away in a silver 1990 Ford Festiva. Her family reported her missing the next day.

Searchers scoured nearby forests and rural areas for weeks. Two days after she vanished, her car was found abandoned in the Lock Haven Hospital parking lot in third gear with the emergency brake on and the keys missing; the vehicle produced no clues to her whereabouts. Attention turned to a coworker, Loyd Groves, after witnesses said he and Heckel argued loudly the morning she disappeared and he was seen chasing her through the plant; his van was also seen leaving the company lot around the same time. Friends said she had been fearful of him and had accused him of stalking and sending lewd messages. Her husband was away on National Guard duty and was ruled out as a suspect.

No body had been found and the case remained unresolved. If anyone knew Katherine, saw her car on July 15, 1991, or has information about her movements that day, please share what is known.