Additional Reporting By: Asia Alexander, Elisabeth Brier, Sofia Chierchio, Zoya Hasan, Chris Helman, Monica Hunter-Hart, Luisa Kroll, Katherine Love, Simone Melvin, Andrea Murphy, Rich Nieva, Chase ...

Nancy Guthrie, mother of "Today" show co-host Savannah Guthrie, has been missing from her Tucson-area home for six days. A ransom letter demanding millions in Bitcoin was sent to the media, with ...