How discarded chewing gum helped convict a serial rapist of two cold case murders
How Discarded Chewing Gum Helped Convict a Serial Rapist in Two Cold Case Murders
A Unlikely Lead in a Long-Forgotten Crime
How discarded chewing gum helped convict – In the quiet town of Everett, Washington, a seemingly ordinary encounter between three investigators and a man in pajamas would spark a pivotal breakthrough in two decades-old murders. Susan Logothetti, then a police officer, and two colleagues approached Mitchell Gaff’s residence on a cold January day in 2024, armed with promotional flyers for a chewing gum brand. Their mission was not to solve a crime but to engage with the public. Gaff, 68, welcomed them into his home, where he eagerly sampled various gum flavors. What Logothetti would later describe as a moment of revelation occurred when a colleague presented him with a small dish, prompting Gaff to spit a piece of gum into it. The saliva left behind became the key to unraveling a mystery that had eluded authorities for years.
“I vividly recall observing him expel the initial gum piece into the ramekin, noting the saliva,” Logothetti recounted to CNN. “At that moment, I knew something extraordinary was about to unfold.”
The Breakthrough That Changed Everything
Four years after the 1984 murder, forensic scientists analyzing the DNA from the gum sample discovered a match with evidence found on the victim’s body. This finding, detailed in an affidavit of probable cause submitted in March 2024, linked Gaff to both crimes. The “gum ruse” emerged as a critical piece of evidence, bridging the gap between two separate investigations. At the time of the murders, DNA profiling had not yet become a standard forensic tool, leaving many clues unexplored. However, the timely collection of vaginal swabs in Weaver’s case, as noted in court documents, proved instrumental in the eventual breakthrough.
Gaff, a convicted rapist, admitted to the killings of Judy Weaver and Susan Vesey on April 16, 2024, during a guilty plea proceeding. He faces a potential life sentence as his trial approaches. The murders of the two women—Vesey in 1980 and Weaver in 1984—had initially been treated as unrelated incidents, with each case yielding suspects but no convictions. It was not until modern DNA technology caught up that the connections began to surface.
A Legacy of Suspicion and Science
The files on Weaver’s murder, inherited by Logothetti from previous officers, were filled with theories ranging from money laundering to cocaine use. Her boyfriend, the primary suspect at the time, died in 1994, leaving the case stagnant. Yet, in 2020, the emergence of advanced DNA profiling methods led investigators to revisit the case, uncovering new leads. This revival culminated in the use of STRmix, a cutting-edge software that allows analysts to extract DNA profiles from minute traces, even when mixed with other biological material.
Lisa Collins, a forensic scientist at Washington State Patrol, explained to CNN how tools like STRmix and genetic genealogy have transformed cold case investigations. “These technologies enable us to do more with less,” Collins said, highlighting the software’s ability to isolate DNA from small samples. In Weaver’s case, a binding on her body contained DNA from her, her boyfriend, and an unknown third person. By removing the known contributors, Collins and her team narrowed the focus to the elusive suspect.
The Crimes and the Confession
According to Gaff’s statement, the murders unfolded in a sequence of calculated violence. In 1980, Vesey—a 21-year-old mother of two—was found dead in her home. Gaff claimed he had randomly targeted her, entering through an unlocked door and proceeding to tie her up, beat her, rape her, and strangle her. Afterward, he wrapped cords around her neck and ignited a corner of the bedspread, aiming to obliterate evidence of his crime. Four years later, he attacked Weaver, a 42-year-old mother, in her bedroom, setting fire to the room in a bid to conceal his actions.
“Ms. Weaver died because of my actions,” Gaff stated in his plea. “Before leaving, I wrapped cords around her neck and lit the bedspread to cover up my crime.”
He admitted he had no prior connection to either victim, making the DNA evidence all the more compelling. The confirmation of his identity came when Mary Knowlton, another forensic scientist, used the DNA profile from Weaver’s case and input it into the Combined DNA Index System (CODIS), a national database of convicted offender profiles. The match was found in November 2023, leading to the reopening of both investigations.
A New Dawn for Cold Cases
The resolution of these two cases underscores the transformative power of forensic science. What once seemed like separate incidents now share a common perpetrator, thanks to advancements in genetic analysis. For families who had long carried the burden of uncertainty, the identification of Gaff brought a sense of closure. “The cases just needed science to catch up,” Logothetti reflected, emphasizing how technology can resurrect dormant evidence.
Collins also highlighted the role of genetic genealogy in connecting suspects to victims through familial DNA links. This method, which became widely adopted in the 2010s, has since been pivotal in solving numerous cold cases. In the Weaver and Vesey murders, it was the combination of new software and a willingness to revisit old evidence that led to the breakthrough. The story serves as a testament to the resilience of investigative work and the evolving nature of forensic tools, proving that even the most elusive crimes can be solved with the right approach.
As Gaff prepares for sentencing, the case has become a symbol of how everyday items—like a piece of discarded gum—can hold the key to justice. The journey from a casual sample to a conviction is a reminder of the importance of persistence, innovation, and the intersection of science and law in uncovering truth. For the victims’ families, the closure offered not only a resolution to their grief but also a renewed hope in the effectiveness of modern forensic methods.
