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Washington Man Pleads Guilty to 1980s Cold Case Murders

4/22/2026, 5:08:48 AM

Overview of the Cold Case Resolution

Mitchell A. Gaff, a 68-year-old man from Washington State, pleaded guilty to two counts of first-degree murder related to cold cases from the 1980s. Gaff's admissions pertain to the murders of Susan Vesey, found dead in her home on July 12, 1980, and Judy Weaver, discovered on June 2, 1984. His guilty plea was entered in Snohomish County Superior Court, following a unique investigative technique that linked him to the crimes through DNA found on chewing gum.

Investigative Breakthrough

The breakthrough in the case came when undercover investigators approached Gaff under the pretense of conducting research for the gum industry. They offered him free samples, during which he discarded the used gum into cups. The DNA from these samples was later matched to evidence from both murder scenes using the Combined DNA Index System (CODIS). This method allowed authorities to connect Gaff to the crimes, leading to his arrest in May 2024 for Weaver's murder, followed by charges for Vesey's murder in March 2026.

Gaff's Criminal History

Gaff has a long history of violent offenses, including multiple convictions for sexual assault. He has been diagnosed as a "sexual sadist" and has previously served time for various crimes, including assault and burglary. Notably, in 1984, while on probation, he attacked two young girls, tying them up and assaulting them. His criminal activities reportedly included attempts to assault numerous women, with admissions of raping at least eight.

Official Statements & Responses

Everett Mayor Cassie Franklin praised the Everett Police Department for their role in solving the cold cases, highlighting the importance of advancements in DNA analysis. She stated, “We honor Susan’s memory as we bring this suspect to justice.” The Everett Police Department confirmed Gaff's confessions were consistent with their findings during the investigation.

Criticism & Opposition

While the investigation has been largely praised, some critics have raised concerns about the ethical implications of using deceptive methods to obtain DNA evidence. The tactics employed by investigators, while effective, have sparked discussions about the boundaries of law enforcement practices in cold case investigations.

What's Next

Mitchell Gaff is scheduled for sentencing on May 13, 2026. The resolution of these cold cases has brought closure to the families of the victims, while also highlighting the ongoing challenges and complexities of addressing historical violent crimes.

Verbatim Quotes

  • “Mr. Gaff provided statements in both homicides, admitting to his crimes in open court,” — Everett Police Department
  • “I am so proud of our Everett Police Department for solving this murder case by utilizing advancements in DNA analysis techniques,” — Cassie Franklin, Mayor of Everett