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 Breakthrough in Cold Case Solving

How discarded chewing gum helped convict – Four decades after the murder of Judy Weaver, a forensic discovery in a seemingly mundane act—spitting into a dish—led to the identification of Mitchell Gaff as the perpetrator of both crimes. The case, which had languished for years with no clear leads, hinged on a pivotal moment in 2024 when Gaff unknowingly provided critical DNA evidence during a casual interaction with three undercover detectives.

“I remember watching him spit the first piece of gum into the ramekin and seeing the saliva, and it was very hard for me to contain my excitement,” Susan Logothetti recalled of the January 2024 encounter.

Logothetti, a police officer, and her colleagues were distributing flyers for a chewing gum company when they approached Gaff’s home. The 68-year-old man, already a convicted rapist, greeted them with pajama pants and invited them in for a taste test. As he eagerly sampled different gum flavors, the officers carefully observed his actions, ultimately collecting a saliva sample that would link him to two murders from the 1980s.

From Unrelated Cases to a Single Perpetrator

The two killings—of Susan Vesey in 1980 and Judy Weaver in 1984—had initially been treated as separate incidents. However, the DNA evidence extracted from Gaff’s spitting during the 2024 encounter provided a crucial connection. According to an affidavit of probable cause filed in March, the gum ruse became the key to confirming his involvement in both crimes.

Gaff, who admitted to murdering Vesey and Weaver on April 16, faces up to life in prison at his sentencing on Wednesday. His guilty plea statement detailed the brutal methods he used in each case. In 1980, he had broken into Vesey’s home, tied her up, and subjected her to violence before strangling her. Four years later, he attacked Weaver in her bedroom, setting fire to the room in an attempt to erase evidence. “Before leaving I wrapped cords around her neck and lit the corner of the bedspread in an attempt to cover up my crime,” Gaff said.

The Role of Forensic Science in Unearthing Truths

At the time of the murders, DNA profiling was not yet a reliable tool for forensic investigations. Despite this, law enforcement in Weaver’s case had the foresight to request vaginal swabs from the crime scene, which were submitted a few hours after her death. The evidence, though limited, remained untouched for years, until modern technology could finally unlock its secrets.

Susan Logothetti, who inherited the case file from her predecessors at the Everett Police Department, described the initial investigation as filled with speculative theories. Among them were wild claims about money laundering and cocaine use, which had left the families of the victims in confusion. The breakthrough came when forensic scientists revisited the case in 2020, using advancements in DNA analysis to re-examine the evidence.

Technology and the Path to Justice

The evolution of DNA technology played a vital role in solving the cold cases. Lisa Collins, a forensic scientist at Washington State Patrol, explained to CNN that new software and genetic genealogy techniques have revolutionized the field. “These are two relatively recent watersheds in DNA technology that have allowed for breakthroughs in cases like these,” Collins stated.

Collins, who took over Weaver’s case in 2003, highlighted how tools like STRmix enable scientists to work with smaller DNA samples. In Weaver’s murder, a binding on her body contained a mix of her DNA, her boyfriend’s DNA, and a trace from an unknown third person. By isolating the sample and applying STRmix, forensic experts narrowed down the possible matches. Mary Knowlton, the scientist who analyzed the evidence, then input the profile into the Combined DNA Index System (CODIS), a national database of offender profiles, and found Gaff as a match in November 2023.

Impact on Victims’ Families

The resolution of the cases brought significant relief to the families of the victims, who had endured years of uncertainty. Logothetti emphasized that the breakthrough was not just about solving a mystery but about restoring a sense of closure. “The Weaver and Vesey cases just needed science to catch up,” she said.

Vesey, a 21-year-old mother of two young children, was killed in a violent attack that occurred in her own home. Gaff’s statement revealed how he had targeted her, entering through an unlocked door and escalating the assault. Weaver, a 42-year-old mother, was similarly victimized in her bedroom, with the fire serving as a deliberate attempt to conceal her death. The connection between the two murders was a revelation that reshaped the investigation and confirmed Gaff’s guilt.

Despite the damning evidence, Gaff’s defense attorney, Heather Wolfenbarger, declined to comment. The case underscores the transformative power of DNA technology in cold case investigations. While the initial evidence had been overlooked, the new tools allowed for a precise match, linking Gaff to both crimes with scientific certainty.

A Legacy of Uncovered Truths

The gum ruse exemplifies how everyday moments can become turning points in justice. What began as a routine encounter turned into a pivotal moment for the victims’ families, who had long sought answers. For Vesey’s relatives, the confirmation of Gaff’s guilt was a step toward healing, while Weaver’s family found solace in the final resolution.

Logothetti’s account of the 2024 encounter also sheds light on the emotional weight of the discovery. “It was very hard for me to contain my excitement,” she reflected, highlighting the anticipation that accompanied the DNA analysis. The process of linking Gaff to the murders involved meticulous work, from collecting the saliva sample to matching it against the national database.

As the case moves toward sentencing, the story serves as a testament to the enduring impact of forensic science. What once seemed like unrelated events has now been connected through a combination of persistence and technological innovation. Gaff’s admission, though late, has provided the clarity that eluded investigators for decades.

Ultimately, the case demonstrates how even the smallest pieces of evidence can unravel the most complex mysteries. The DNA from a single piece of gum became the cornerstone of a conviction that had been out of reach for years. For the families of Vesey and Weaver, this was more than a legal verdict—it was a beacon of hope and a step toward justice.