Barbara Louise Cotton was 15 and a sophomore at Williston High School when she vanished from Williston, North Dakota, on the evening of April 11, 1981. Known to family as Barbie, she was reportedly last seen leaving the Triangle Nite Club after having dinner with a male friend; witnesses said she walked off alone and never reached home. She was described as 5 feet 2 inches, about 100 pounds, with brown hair and hazel eyes, wearing a jacket, a light blue blouse, jeans, and brown shoes.

Barbara was considered independent and had no history of running away, which led family and investigators to suspect foul play. A man named Stacey Werder, seen with her that day, was questioned but never charged. Despite searches and periodic investigative efforts, over four decades later no solid leads or physical evidence have emerged and the case remains unsolved.

If anyone knew Barbara, the people she spent time with that night, or remembers seeing her in Williston on April 11, 1981, please come forward with information.