New details have been released in the investigation into the disappearance of Today host Savannah Guthrie's mother as the search enters its third day. Nancy Guthrie, 84, was last seen Saturday night at her home in the Tucson, Ariz., area, where she lived alone and was reported missing Sunday. Authorities believe she was taken against her will."We believe she was taken out of the home against her will, and that's how this investigation is moving," Pima County Sheriff Chris Nanos told NBC Nightly News.