The sheriff leading the investigation into the disappearance of Nancy Guthrie is facing new scrutiny after details about his past disciplinary record surfaced. Pima County Sheriff Chris Nanos, who has been overseeing the high-profile missing persons case, acknowledged through his attorney that he resigned from a previous police job decades ago to avoid disciplinary action. Sheriff's past resignation raises new questions Sheriff Chris Nanos admitted through his lawyer, James Cool, that he left the El Paso Police Department in 1982 to avoid a three-day suspension for insubordination.