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A photo of a similar ball cap Bonkowski was wearing. (NPS)

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Double-fatality under investigation at Grand Canyon National Park

NPS investigative branch asking for public's help

Jessica Bartz, 22, and Garret Bonkowski, 25, are believed to have entered the park Sept. 18 and were found below Trailview 2 Overlook on the Sourth Rim earlier this month.