The search for Nancy Guthrie, the 84-year-old mother of Today show co-host Savannah Guthrie, has now entered a critical new phase as investigators focus on the power of forensic DNA and genetic genealogy to identify the mysterious intruder caught on camera outside her Catalina Foothills home near Tucson. 31 days after Nancy vanished, law enforcement sources say there are still no active leads strong enough to secure a new warrant, but experts say the DNA trail left behind in the home could still lead investigators directly to the person responsible. In this episode of Drop Dead Serious, Ashleigh is joined by former Texas Ranger Brandon Bess, now a private investigator with PPI Security in Houston, who explains the real-world detective work behind genetic genealogy, from tracking family trees to knocking on doors and collecting DNA that can finally identify a suspect.

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Mystery Kidnapper Exposed: The DNA Trail That Could Crack the Nancy Guthrie Case