Tanya Van Cuylenborg was 18 when she and her boyfriend, 20-year-old Jay Cook, left British Columbia for an errand in Seattle on November 18, 1987. They were last seen after boarding a Bremerton–Seattle ferry. When they failed to return the next day, families reported them missing.

On November 24 Tanya’s body was found in a ditch in rural Skagit County. She had been sexually assaulted, bound with plastic zip ties, and shot in the back of the head. The following day, Tanya’s wallet and the van’s keys were found discarded under a tavern porch in Bellingham; the van was later located in a nearby parking lot. On November 26 Jay Cook’s body was discovered under a bridge nearly sixty miles from Tanya’s location; he had been beaten with rocks and strangled. Investigators recovered the killer’s DNA from semen on Tanya’s pants but had no match in criminal databases.

A genetic genealogy investigation in 2018 produced a suspect, and an arrest followed; subsequent trial testimony focused on the DNA from Tanya’s body and the presence of zip ties at multiple locations. Does anyone have information about Tanya or Jay’s activities in the hours after they boarded the Bremerton–Seattle ferry?