Watch live: Pima County sheriff provides update on search for Nancy Guthrie

Pima County Sheriff Chris Nanos will brief reporters Thursday afternoon on the search for Nancy Guthrie, the 84-year-old mother of "Today" show host Savannah Guthrie. Nancy Guthrie was last seen around 9:30 p.m. local time Saturday, when she was dropped off at her home in the Tucson, Ariz., area. Her family reported her missing the...