Mark Wayne Adamson was 36 when he was last seen on July 8, 1995, in the parking lot of the Walmart on the 600 block of Montara Road in Barstow, California. He was seen about 1:30 p.m. with Joseph Riley getting into a maroon American model sedan, possibly with a third person. Adamson’s roommate said the two left with a large amount of cash intending to buy a vehicle. At the time he vanished Adamson was described as a white male, 6 feet 2 inches, about 260 pounds, with brown thinning hair, hazel eyes and possibly a beard and mustache; he was last seen in blue jeans, a t-shirt and a Giants hat.

Authorities suspect foul play and investigators developed a theory that the disappearances were drug-related and that Adamson and Riley were likely killed and buried in the Mojave Desert. In December 2012 James Linzy Franklin and Christian Leonard Bunty Sr. were charged in connection with the deaths; later legal actions included the arrest of Steven Michael Dondero, charges against Bunty being dropped in spring 2014, Dondero pleading to being an accessory in March 2015, and Franklin being convicted in September 2015. The bodies of Adamson and Riley have never been found.

If anyone knew Adamson’s movements that day, the vehicle he drove into, or saw a maroon American model sedan in Barstow on July 8, 1995, please come forward with information.