The Forever Witness

In November 1987, 18-year-old Tanya Van Cuylenborg and her boyfriend, Jay Cook, who was nearly 21, left their homes on Vancouver Island, British Columbia, for an overnight trip to Seattle to pick up a replacement furnace for Jay's father's heating business. They took a scenic route by ferry and highway across Washington's remote Olympic Peninsula, missed a critical turn, and were last seen alive at a convenience store in Allyn, Washington. They never arrived at the furnace supplier. Within days, Tanya's body was found shot execution-style on a rural road in Skagit County, and Jay's battered, strangled body was discovered beneath High Bridge near Monroe in Snohomish County, roughly 65 miles away. Despite an international manhunt, blanket media coverage, and decades of investigation, the killer eluded identification. The Forever Witness traces the 31-year journey from the crime through the revolutionary use of genetic genealogy, a technique in which investigators upload crime-scene DNA to consumer databases and build the unknown suspect's family tree to identify him, to finally solve it.

Author Edward Humes reconstructs the couple's final hours through witness accounts from store clerks along their route, then details the anguished search launched by Tanya's father, Willem "Bill" Van Cuylenborg, a prominent solicitor who retraced their path by car, ferry, and hired airplane while police initially refused to act. The discovery of Tanya's body on November 24, 1987, triggered a massive forensic response. Investigators found plastic flex ties near her body, a shell casing, and semen from an unknown male. Behind Essie's Tavern in Bellingham, a bartender turned over identification cards found in the back lot. Nearby, the Cooks' distinctive copper-colored Ford van sat in a parking lot, ransacked, with blood, more flex ties, and semen on Tanya's pants from a source that excluded Jay. A single palm print was lifted from the van's rear door. Jay's body, found on Thanksgiving Day by a hunter's bird dog, showed a starkly different method of killing: He had been bludgeoned with rocks, gagged with a cigarette pack, and strangled with a garrote made of dog collars and twine.

Humes traces the long stall of the investigation through waves of fruitless tips, a 1989 episode of Unsolved Mysteries, and hateful Christmas cards sent to the families by someone claiming credit for the murders. The families' grief is rendered through intimate portraits: Bill Van Cuylenborg never recovered from his daughter's death and died of a stroke in 1997 at age 62, while Jay's mother, Lee Cook, firmly defended her son against early police suspicion. Forensics experts preserved the crime-scene DNA in deep-freeze storage, betting that future technology would someday unlock what 1987 science could not.

The narrative shifts to Detective Jim Scharf, who joined the Snohomish County Sheriff's cold case unit in 2005 and inherited the Van Cuylenborg-Cook file. Humes profiles Scharf as a patient, empathetic interrogator whose technique relied on building rapport and strategic deception. Scharf created a deck of cold case playing cards distributed in prisons and jails, with Jay and Tanya featured as the king of hearts. The cards generated a tip that led him to the author of the Christmas letters, whom Scharf tracked to the Seattle Public Library in 2010. The man confessed to writing the letters but was cleared by DNA. Every suspect Scharf pursued was similarly eliminated. The killer's DNA, uploaded to the FBI's Combined DNA Index System (CODIS), a national database of convicted offenders' genetic profiles, had never produced a match.

Humes introduces the parallel development of genetic genealogy through the three ages of DNA in criminal forensics: Alec Jeffreys's 1984 discovery of DNA fingerprinting, the CODIS database era of the 1990s, and the emerging third age, in which consumer DNA kits and relative-finder tools could identify people who had never taken a test themselves. CeCe Moore, a former actress who abandoned her career to become a pioneer in this field, demonstrated the method's potential by reuniting an abandoned newborn, dubbed "Baby Alpha Beta" after being left outside an Anaheim supermarket in 1987, with her birth mother. Moore's attempts to persuade forensic scientists that the same methods could identify violent criminals were repeatedly rebuffed.

Scharf, meanwhile, learned of Parabon NanoLabs, a Virginia company that had developed a Pentagon-funded technology called Snapshot, capable of generating computer-rendered portraits of suspects from crime-scene DNA. Scharf held a press conference in April 2018 to unveil portraits of the killer, generating 130 tips but no breakthrough. Then, on April 25, 2018, the arrest of the Golden State Killer, Joseph James DeAngelo Jr., transformed the landscape. Genetic genealogist Barbara Rae-Venter had identified DeAngelo by uploading his crime-scene DNA to GEDmatch, an open public database where amateur genealogists compared their genetic profiles, and reverse-engineering his family tree. GEDmatch publicly acknowledged the search, effectively resolving Moore's ethical concerns about working with law enforcement.

Within days, Parabon uploaded the killer's DNA profile to GEDmatch, and Moore began the genealogy work. She identified two second-cousin-level matches from different family lines: a Talbott relative on the father's side and a Rustad relative on the mother's side. Through obituaries and birth records, she traced the sole connection between the two families and identified the only male child of that marriage: William Earl Talbott II, born in 1963. Moore completed the identification in two hours.

Scharf launched a surveillance operation and discovered that Talbott had lived with his parents on the Woodinville-Duvall Road, just seven miles from High Bridge, and had lost his job at an aerospace firm shortly before the murders. After days of surveillance, undercover officers recovered a coffee cup Talbott dropped from his truck cab. The crime lab confirmed the DNA match, and on May 17, 2018, Scharf arrested Talbott at his trucking depot. Talbott refused to speak beyond requesting a lawyer.

Interviews with Talbott's family revealed a deeply troubled history: animal cruelty as a child, violence toward his siblings, and a volatile temper consistently minimized by his mother. Yet friends and neighbors described a generous, hardworking man, particularly after 1987, when his sisters noted an unexplained personality transformation. Former friend Michael Seat recalled hiking with Talbott near High Bridge, establishing Talbott's familiarity with that murder scene. After the arrest, Seat was struck by a vivid memory of seeing the Cooks' van parked in the Talbott family driveway around the time of the murders, a recollection that tormented him with the thought that Tanya might have been alive inside.

The trial became the first criminal case in the world in which genetic genealogy played a role in identifying the suspect. The defense conceded the DNA evidence but argued that Talbott had consensual sex with Tanya and that someone else killed both victims. Prosecutor Matthew Baldock chose not to present a speculative theory of the crime, instead relying on established facts: Talbott's DNA on and inside Tanya, his palm print on the van, and circumstantial connections to the murder scenes. The jury convicted Talbott of two counts of premeditated first-degree murder. He gasped, "But I didn't do it," as the verdict was read and received two consecutive life sentences without possibility of parole.

In late 2021, the Washington State Court of Appeals overturned the conviction, granting a new trial on the grounds that a juror who expressed potential difficulty with impartiality should have been dismissed during jury selection. Prosecutors appealed to the state supreme court. Meanwhile, Moore's genetic genealogy identifications reached 175 cases by September 2021, and Maryland became the first state to regulate the practice. Humes highlights a serious equity problem: Nearly all suspects identified through genetic genealogy are white men, and most victims are white women, because consumer DNA databases are overwhelmingly populated by people of European ancestry. The book closes with a warning that the greater threat to genetic privacy lies not in police searches for killers but in the largely unregulated consumer DNA industry, where more than 40 million Americans have surrendered their most sensitive biological information to profit-making companies.