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Grand Canyon Superintendent Chris Lehnertz is returning to the park after an OIG investigation initiated in October cleared her of any wrongdoing. (Loretta Yerian/WGCN)

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Exonerated by investigation, Chris Lehnertz to return to Grand Canyon

A U.S. investigation at Grand Canyon National Park has ended with the exoneration of the park's superintendent and an announcement that she'll return to work soon.