The episode recounts the successful investigation and identification of the killer of Teree Becker, a woman who was found murdered in 1975. Using DNA evidence and genetic genealogy, investigators connected the crime to Thomas Martin Elliot, a career criminal who died by suicide in 1991. The investigation took almost 50 years and involved comparing DNA profiles, using a family tree to identify possible relatives, and tracking Elliot's criminal history. The investigation finally provided closure for Becker's family, who described her as a free spirit who enjoyed life to the fullest.
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