Robert Anderson, 31, and his girlfriend Kristen Diede were last seen on August 15, 1993, in Wishek, North Dakota, after traveling from Minnesota to drop Diede’s two children with their paternal grandparents. Diede called friends that day saying she was having trouble retrieving the children amid a custody dispute. The couple visited her brother and then left to return home but never arrived.

On August 20 their van was found abandoned in a parking lot at a railroad station in Aberdeen, South Dakota, about 100 miles from Wishek; all their belongings had been left behind in Minnesota. Early suggestions of a voluntary disappearance were rejected by Diede’s family, and investigators now consider foul play likely. Repeated public appeals and a reward have produced no conclusive leads.

Anyone who was traveling or working between Wishek and Aberdeen around August 15, 1993, or who has information about the van or sightings of Anderson and Diede is asked to come forward.