India, Feb. 6 -- The Pima County Sheriff, Chris Nanos, addressed reporters at a Thursday press conference where he released a new, detailed timeline of Savannah Guthrie's mother, Nancy Guthrie, on the day of her disappearance.

The updated timeline is based on electronics, home security data and family reports and offers a clearer sequence of events before and after Nancy was last seen at her Tucson home in the Catalina Foothills area.

Investigators are treating her disappearance as an active investigation with the belief that she is still "out there." However, Nanos has reiterated that no suspects or persons of interest have been identified yet.

On January 31, 5:32 p.m., Nancy Guthrie went to her daughter's house for dinner by taking a...