Mike Riemer, 36, disappeared after a December 12, 1985 outing with his 21-year-old girlfriend Diana Robertson and their two-year-old daughter Crystal in Pierce County, Washington. Crystal was later found alone outside a Kmart in Spanaway, about 30 miles from where the family had been, and told investigators her mommy is in the trees. A massive search followed.

In February 1986 Diana’s body was found on a remote logging road; she had been stabbed 17 times and had a tube sock tied around her neck. Riemer’s red Plymouth pickup was located nearby with bloodstains on the seat and a manila envelope on the dashboard reading I love you, Diana, believed to be in Riemer’s handwriting. Riemer was a prime suspect and was missing until a partial skull found in March 2011, within a mile of Robertson’s body, was identified by dental records as his. The skull ruled out a gunshot wound but did not establish a cause of death.

Investigators have noted similarities to the August 1985 slayings of Steven Harkins and Ruth Cooper, including a tube sock around Cooper’s neck, and the cases have been linked as the Tube Sock Killings. No arrests or definitive suspect have been announced. Did anyone in the area at the time see the Riemer pickup or remember the family’s outing that day?