The Disposable Coffee Cup That Solved a 31-Year-Old Pacific Northwest Cold Case

A Routine Errand Turns into a Pacific Northwest Mystery

In November 1987, Jay Cook, aged 20, and Tanya Van Cuylenborg, aged 18, embarked on what was supposed to be a simple, routine journey. The young Canadian couple, who had been dating for six months, left their hometown of Saanich on Vancouver Island to run an errand for Jay’s family heating business. Driving a bronze 1977 Ford Club Wagon van owned by Jay’s father, their plan was straightforward: board a ferry across the border to Port Angeles, Washington, purchase furnace parts, and return home shortly thereafter. For the two teenagers, the quick trip also represented their very first road trip alone as a couple.

They boarded the afternoon ferry and arrived in Washington State, making brief stops along their route. Surveillance records and store receipts placed them at a local store asking for directions after taking a wrong turn, followed by a late-night stop at a convenience store in Allen, Washington. At 10:16 PM, they purchased a ferry ticket in Bremerton with plans to sleep in their van near Seattle before picking up the equipment the next morning. However, they never returned home, and neither reached their intended destination. When days passed without any communication, Tanya’s family filed a missing persons report, triggering an intense multi-agency search across state and national borders.

Tragic Discoveries Across County Lines

The chilling reality of their disappearance emerged six days after they set out. On November 24, 1987, a passerby discovered Tanya’s body in a rural ditch near Alger in Skagit County, Washington. Investigators found that she had been sexually assaulted, bound with plastic zip ties, and shot in the head. The following day, Jay’s family van was found abandoned in a parking lot in Whatcom County, miles away from where Tanya was recovered, containing biological evidence and personal belongings.

On November 26, 1987, the tragic investigation reached another dark milestone when Jay’s body was discovered near the Snohomish River in Snohomish County. He had been severely beaten and strangled, his body covered with a blue blanket. The horrific nature of the double homicide shocked local communities. Detectives were faced with two separate crime scenes spanning multiple counties, no obvious motive, no known connection between the victims and their assailant, and zero eyewitnesses. Despite exhaustively interviewing friends, family, and potential witnesses along the travel route, traditional police work hit a brick wall.

Decades of Frustration and Preserved Evidence

During the late 1980s, forensic science relied primarily on fingerprint matching, blood typing, and direct physical evidence. Although biological material containing the killer’s DNA was carefully collected from Tanya’s clothing and preserved by crime scene technicians, the technology required to analyze and match unknown genetic profiles did not yet exist. There were no national DNA databases like CODIS to run unknown samples against convicted offenders.

As years turned into decades, the case gradually went cold. Annual anniversaries passed without breakthroughs, leaving two families enduring endless grief and uncertainty. Detectives assigned to the case retired, handing the thick investigative binders down to a new generation of law enforcement officers who refused to let the case be forgotten. In 2017, investigators attempted DNA phenotyping, a technique that uses genetic code to predict physical characteristics such as eye color, hair color, and skin tone. The resulting composite sketches generated nearly one hundred public tips, but none identified the suspect. The physical evidence remained locked in cold storage, waiting for science to catch up.

The Breakthrough of Investigative Genetic Genealogy

The turning point arrived in 2018 following the landmark arrest of California’s Golden State Killer through investigative genetic genealogy. Realizing the potential of this emerging field, Snohomish County detectives partnered with Parabon NanoLabs to upload the unknown killer’s DNA profile—laboriously preserved since 1987—to GEDmatch, a public genealogy database where individuals voluntarily upload genetic data to explore family history.

The search produced partial DNA matches with two second cousins of the suspect. Genetic genealogists undertook a complex, painstaking process of building out massive family trees, working backward through generations of public records, marriage licenses, census data, and obituaries. By mapping where the family branches intersected, researchers narrowed millions of possibilities down to a single individual who matched the suspect’s age profile and geographical location in 1987: William Earl Talbott II, a commercial truck driver living in Washington State.

A Discarded Coffee Cup and Historic Justice

Because investigative genetic genealogy merely identifies a potential candidate rather than providing admissible court proof, detectives needed a direct DNA sample from Talbott to confirm the match. Undercover officers monitored his routine without alerting him. The decisive moment occurred in May 2018 in a Seattle parking lot, when a disposable coffee cup fell from Talbott’s truck. Detectives immediately retrieved the cup and rushed it to the state crime laboratory.

DNA extracted from the rim of the coffee cup matched the suspect profile from Tanya’s clothing with mathematical certainty. On May 17, 2018—thirty-one years after the murders—police arrested William Earl Talbott II. The arrest made history as the first time investigative genetic genealogy led to an arrest that proceeded directly to a full jury trial. In June 2019, a jury found Talbott guilty of two counts of aggravated first-degree murder, resulting in two consecutive life sentences without the possibility of parole.

Legal Appeals and Final Closure

The path to justice encountered one final, dramatic obstacle in December 2021, when a state appeals court overturned Talbott’s conviction due to alleged bias involving a juror during jury selection. The decision forced the victims’ families to confront the painful prospect of a second trial. However, prosecutors appealed to the Washington State Supreme Court.

In December 2022, the state’s highest court unanimously reversed the appellate ruling and reinstated Talbott’s original convictions, determining that defense attorneys had waived their objection by failing to challenge the juror during trial selection. After thirty-five years of grief, legal battles, and technological evolution, the case was permanently closed, establishing a monumental legal precedent and proving that modern science can deliver accountability no matter how much time has passed.