Man Pleads Guilty in 1980s Washington Murders Solved Through DNA Recovered From Chewing Gum

(LibertyInsiderNews.com) – A Washington cold-case break shows how a simple piece of chewing gum can finally put a violent predator away—while raising hard questions about privacy, policing, and decades of government failure to protect the innocent.

Quick Take

Mitchell Gaff, 68, pleaded guilty to two counts of first-degree murder in the 1980 and 1984 killings of Susan Vesey and Judith “Judy” Weaver.
Investigators confirmed Gaff’s DNA using a “gum ruse,” collecting chewed gum he discarded after police posed as gum-company researchers.
Washington’s older indeterminate sentencing rules applied because the murders occurred in the early 1980s, leading to a 50-years-to-life sentence.
The case highlights both the power of preserved evidence and DNA databases—and the ethical gray areas of covert DNA collection.

How two brutal murders finally reached a courtroom

Mitchell Gaff, an Everett, Washington man with a history of sexual violence, was sentenced in May 2026 to 50 years to life in prison after pleading guilty to two first-degree murders. The victims were Susan Vesey, killed in 1980, and Judith “Judy” Weaver, killed in 1984. Both women were sexually assaulted and murdered, and both cases sat for decades without a conviction until modern DNA testing and database matching made prosecution possible.

Investigators said Vesey was raped and strangled in her home while her young children were present in the house. Weaver was raped, robbed, and murdered in Everett, with biological evidence collected from her body and preserved for later testing. Those facts matter because cold cases live or die on evidence handling: when departments keep items properly stored, science can eventually do what outdated methods couldn’t, even if leadership and staffing have turned over many times.

The “gum ruse” and why it worked

Detectives still needed a fresh DNA sample to confirm the suspect flagged by database work. In January 2024, investigators used an undercover approach described as a “gum ruse.” Police posed as researchers for a gum company, invited Gaff to chew gum, and asked him to discard it in a dish. They then recovered the chewed gum and tested it, finding DNA consistent with evidence from Weaver’s assault and murder.

From a conservative law-and-order perspective, the public’s instinct is straightforward: a repeat offender who allegedly escaped accountability for decades should not get special sympathy because police were creative. At the same time, the method underscores a broader tension in American life—government power tends to expand through “clever” workarounds. The strongest principle is simple: aggressive investigative tactics should remain focused on serious violent crimes, with clear oversight and limits.

CODIS, preserved evidence, and the long tail of violent crime

The case also illustrates how a national DNA database can quietly close cases long after headlines fade. Gaff’s DNA profile was already in CODIS because of prior crimes. In 1984—months after Weaver’s murder—he committed two violent rapes of teenage sisters, was convicted of second-degree assault, and admitted to additional uncharged rapes in court. Decades later, a CODIS search flagged him as a possible match to Weaver’s case, triggering the push for confirmatory DNA.

After the 2024 arrest for Weaver’s murder, investigators reopened the 1980 Vesey homicide and sent additional items for testing. The Washington State Patrol Crime Lab later matched DNA to Gaff, leading to a second murder charge roughly 46 years after Vesey was killed. The pattern is familiar: families wait, evidence sits, budgets shift, and institutions move on—until a lab result forces the system to admit it still had unfinished business, and that justice delayed is justice denied.

Sentencing under old rules—and what it says about the system

Gaff’s sentence—50 years to life—was shaped by Washington’s indeterminate sentencing guidelines that applied because the murders occurred in the early 1980s. In practical terms, a 68-year-old defendant receiving 50-to-life will almost certainly die in prison, but the structure still frustrates many Americans who want sentencing that is transparent and consistent. When the law changes over decades, outcomes can feel arbitrary, even when guilt is clear and the crimes are horrific.

At sentencing, Gaff apologized to the victims’ families and said he was sorry “not because I was caught” and that no one deserved him entering their lives. Families described the long-lasting impact of the murders, including how Vesey’s killing altered the course of their family history. The case delivers a form of closure, but it also leaves a civic lesson: when violent offenders slip through cracks, citizens lose faith that government exists to do its most basic job—protect people and punish those who prey on them.

Limited public details are available about any appeal plans, and reporting does not specify precisely when the CODIS hit first surfaced. What is clear is that preserved evidence, modern forensic work, and determined investigators produced convictions that the original era of policing failed to secure. The remaining debate is how to balance effective law enforcement against privacy expectations in an age when a discarded object can carry a person’s identity—and when government tools, once normalized, rarely stay narrowly used without firm guardrails.