Former detective Mike Toth tells USA TODAY that the Nancy Guthrie missing person's case may never be closed as the 6-month mark arrives.

Pima County Sheriff Chris Nanos released a statement Thursday marking six months since the disappearance of Nancy Guthrie from her Arizona home.

It's been six months since Nancy Guthrie, the mother of "Today" show host Savannah Guthrie, was kidnapped from her Tucson, Arizona, home.