Details of Disappearance Riemer disappeared from Pierce County, Washington on December 12, 1985. He went missing with his girlfriend, Diana Robertson, and their two-year-old daughter. The child turned up wandering around a local store, alone, later that same day.
Robertson's body was found on an old logging road south of Elbe, Washington in February 1986; she'd been stabbed 17 times and strangled with a sock. Her murder remains unsolved. Riemer remained missing until April 2011, when his skull was found near Mineral, Washington, about one mile from where Robertson had been located. Authorities have been unable to determine a cause of death.