An investigation is underway to determine the cause of death of a hiker found along a trail in Yellowstone National Park.
The body was found Friday by a pair of hikers along the eastern section of the Mary Mountain Trail.
The twenty-one mile long trail runs between Hayden Valley and the Lower Geyser Basin in the central section of the park.
Park rangers responded and found a deceased victim along the trail about 5 miles west of the Hayden Valley trailhead.
There were signs of grizzly bear activity at the scene. Nothing uncovered so far allows for a conclusive cause of death, which apparently occurred on Wednesday or Thursday.
The identity of the victim, a male approximately 60 years of age from Michigan?s Upper Peninsula, is being withheld pending notification of family members.