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flag DNA technology solves 36-year-old cold case murder in Washington, linking John Guillet Jr. to the death of Tracy Whitney.

flag A 36-year-old cold case murder in Washington State has been solved using advanced DNA technology. flag John Guillet Jr., linked to the murder of 18-year-old Tracy Whitney, died from cancer before facing justice. flag Investigators used genetic genealogy, tracing Guillet Jr. through a family member's DNA on file with the medical examiner, to solve the case and provide closure to the victim's family.

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