Katheryn Quackenbush was 17 when she was last seen leaving her home in Delmar, Maryland, on July 14, 1981. Described at the time as a responsible and well-liked teenager with no known reason to leave voluntarily, her disappearance was sudden and unexplained. Initial searches by local authorities and volunteers turned up no significant clues, and widespread publicity in the weeks that followed failed to locate her.

Investigators have examined various leads over the years, including the possibility of foul play, but no solid evidence has been found and the case remains unsolved and an active missing person investigation. Her family has continued to seek answers and law enforcement continues to appeal for information. If anyone knew Katheryn, saw her in Delmar around July 14, 1981, or has information that could help, please come forward.