Christopher Michael Collyer, known as Chris, was 19 when he disappeared after entering the Colorado River near a concrete pier in Rifle, Colorado, in the early evening of a summer day in 1999. Witnesses say he dove in, swam away from the bank, and was swept off as he turned to head back to shore. Despite immediate, extensive searches by multiple law enforcement agencies, no sign of him was ever found.

At the time he vanished Christopher was described as about 6 feet 5 inches and 170 pounds, with reddish-brown hair, green eyes, a goatee, pierced ears and a diamond stud in his left ear. He reportedly had scars on his back, knee and right shin. On the day he was last seen he wore black pants or jeans, red boxer shorts and socks, but no shirt.

Memorials have been placed at the spot where he was last seen and safety measures were increased at the river after the incident. The investigation remains open and the community continues to mark his absence. If anyone remembers Christopher, his clothing, or the events that evening, please share information with the authorities.