This May 19, 2018, photo released by the National Park Service shows Grand Canyon Superintendent, Christine Lehnertz at the Grand Canyon National Park, Ariz. 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. Lehnertz was reassigned in Oct. 2018, while investigators from the Interior Department's Office of Inspector General looked into undisclosed allegations against her. Deputy Director P. Daniel Smith said the allegations were "wholly unfounded" and Lehnertz has demonstrated a commitment to building a respectful workplace. (Michael Quinn/National Park Service via AP)