TUCSON, Ariz. — Pima County Sheriff Chris Nanos said investigators are meticulously reviewing "thousands and thousands of videos" and multiple pieces of DNA evidence as the search for Nancy Guthrie enters its second phase more than 100 days after the 84-year-old mother of NBC "Today" co-anchor Savannah Guthrie vanished from her Catalina Foothills home.

In a detailed briefing Thursday, Nanos described a massive digital and forensic effort underway, shifting emphasis from active search and rescue to a comprehensive evidence trail that could lead to charges. "We have thousands and thousands of videos," he said, referring to doorbell camera footage, traffic cameras, business security systems and private home recordings collected from the greater Tucson area. DNA analysis from blood evidence found inside Nancy's home is also advancing through multiple labs, with some results still pending.

Nancy Guthrie was last seen around 9:50 p.m. on Jan. 31 after her son-in-law Tommaso Cioni dropped her off following a family dinner. When family members checked the next morning, they found signs of forced entry and blood. Her phone, car and personal belongings remained at the residence. A masked individual captured on doorbell footage has been identified as a person of interest, though no arrests have been made.

Massive Evidence Review Underway

Sheriff Nanos emphasized the scale of the investigation. Detectives have canvassed neighborhoods, interviewed dozens of potential witnesses and processed hundreds of tips. The FBI continues to assist with forensic resources and........

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