Aaron Mosus Standing Bear was 18 when he vanished in the winter of 1984. A member of the Cheyenne River Sioux Tribe, he was last seen in Denver, Colorado and was believed to have been traveling to California. After his presence was confirmed in Denver, all communication stopped and he was never heard from again.

At the time he disappeared Aaron was described as between 5 feet 8 inches and 6 feet 0 inches tall, weighing about 180 to 200 pounds, with black hair and brown eyes. His case has been classified as endangered missing, and investigators from the Cheyenne River Sioux Tribal Police and the Colorado Bureau of Investigation have noted the limited details about his movements and circumstances in Denver.

Does anyone who knew Aaron, or who was in Denver that winter of 1984, remember seeing him or have information that could help?