Pima County Sheriff Chris Nanos is facing fresh calls to step down amid criticism of his handling of the investigation into the disappearance of Nancy Guthrie, with a sergeant in his department saying the first week of the investigation was a "sh**show." Guthrie, the 84-year-old mother of Today co-host Savannah Guthrie, was last seen at her home outside Tucson, Arizona, on January 31 and reported missing on February 1. Her disappearance remains unsolved, with no signs of a breakthrough,