Cold case that was solved through DNA and genealogy

On February 25th, 1975, 9-year-old Marcia Trimble left her Nashville home to deliver Girl Scout cookies to a neighbor just two blocks away. She never arrived. Her body was discovered 33 days later, launching one of Tennessee's most intensive investigations that would span nearly five decades.

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This true crime documentary reveals how cutting-edge DNA technology and genetic genealogy finally brought justice to the Trimble family after 46 years of waiting. The case that stumped Nashville police for generations was cracked using a revolutionary technique that combines forensic science with family tree research.
What makes this cold case resolution so remarkable? Police conducted over 5,000 interviews and pursued countless leads, but the killer remained hidden in plain sight for decades. The breakthrough came when Detective Matt Filter used genetic genealogy to upload crime scene DNA to a public database, leading investigators through a complex web of family connections.

How did a discarded coffee cup finally solve this heartbreaking mystery? What role did GEDmatch play in identifying the perpetrator? And why did it take nearly half a century to connect the dots?
This incredible story shows how preserved evidence and advancing technology can deliver justice even in the coldest cases, offering hope to families still searching for answers.

What's your take on using genetic genealogy to solve cold cases? Share your thoughts in the comments below!

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