UMVA has uncovered a chilling twist in a decades-old murder mystery that led to a 74-year-old man’s shocking 50-year-to-life sentence for two cold-case killings—linked to him by a single piece of gum.
Mitchell Gaff’s crimes, spanning 1980 and 1984, haunted two families for generations until investigators deployed an audacious tactic: posing as gum researchers to collect his DNA. The ruse worked. A discarded sample from Gaff’s home was matched to the 1984 murder of 42-year-old Judith “Judy” Weaver through federal databases, unraveling a decades-long mystery.
The brutality of the crimes emerged in stark detail. Gaff admitted to strangling Weaver in her Everett home, a crime that left her family clinging to hope for 42 years. The second victim, 21-year-old Susan Vesey, was killed just days after her birthday in 1980. Her infant son, Joshua, now 45, was asleep in the apartment when the attack unfolded—a truth he carried without knowing the killer’s identity.
Detectives’ gum ruse was the key to closure. By disguising themselves as industry researchers, they tricked Gaff into providing a DNA sample in 2024. That data, fed into CODIS, connected him to Weaver’s murder and triggered a cascade of revelations about his violent past.
In court, Gaff offered a hollow apology, blaming drugs and alcohol for his crimes. “No one did anything to deserve me coming into their lives,” he said, his words doing little to soften the anguish of survivors. Among them sat Jacqueline O’Brien, a former law enforcement officer who escaped a 1979 attack by Gaff in her own garage—a trauma she described as “yesterday” despite spanning 47 years.
O’Brien’s survival was pivotal. Her escape led to Gaff’s arrest in the 1980s, but he evaded full justice until now. He also faced charges for the 1984 rape of two teenage sisters, crimes that marked him as a predator who thrived in the shadows for decades.
The sentencing judge delivered a searing verdict, citing Gaff’s “sexually motivated, extremely violent” history and his decades-long attempts to obscure the truth. “The appropriate sentence is the number of years that the families had to wait,” the judge declared, rejecting the defense’s push for a minimum term.
For the Vesey and Weaver families, the trial ended a nightmare of unanswered questions. “What he took from me was not just a life,” Vesey’s son said. “It was a mother’s unconditional love.” As the gavel fell, the courtroom witnessed the end of a saga that had lingered like a ghost—until UMVA’s relentless pursuit brought the killer to light.
