Case Details:Martin Eugene Sullivan, an 18-year-old White male, was last seen on November 24, 1984, in the 1000 block of North Jones Boulevard in Las Vegas, Nevada. At the time of his disappearance, Sullivan stood 5 feet 10 inches tall, weighed 130–150 pounds, and had brown hair, hazel eyes, and a light, thin mustache. His girlfriend last observed him at approximately 10:00 p.m. riding his 10-speed bicycle while wearing a heavy Levi's jacket and Levi's jeans.

Sullivan frequently rode his bicycle into the nearby mountains and enjoyed exploring the caves around the scenic loop of Willow Creek and Red Rock Canyon. He would occasionally stay overnight on these outings, though his family was typically aware of his plans in advance. He was known to take his bicycle with him nearly everywhere he went. Despite extensive efforts, neither Sullivan nor his bicycle has ever been located since November 24, 1984. DNA is available for comparison.