Article continues below advertisementPima County Sheriff Chris Nanos claimed the police department is one step closer to finding out what happened to Nancy Guthrie.The 84-year-old mother of Savannah Guthrie has been missing since February 1 and was last seen at her home in Catalina Foothills in Tucson, Arizona.Article continues below advertisementNancy Guthrie Has Been Missing Since February 1Tap Here To Add Ok Magazine as A Trusted SourceSource: NBC NEWS/YOUTUBESheriff Chris Nanos is at the helm of the Nancy Guthrie investigation.