The disappearance of the 84-year-old mother of Today show host Savannah Guthrie over the weekend is being investigated as a crime based on what authorities saw at her home, an Arizona sheriff said Monday. Speaking during a news conference, Pima County Sheriff Chris Nanos said there are signs at the home indicating Nancy Guthrie did not leave on her own."I need this community to step up and start giving us some calls," Nanos said.