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A 22-year-old man from Missouri died this week while hiking in an unmarked area of Badlands National Park in South Dakota, police said.
According to a Press release from the Pennington County Sheriff’s Office which was posted on their Facebook page, Maxwell Right of St. Louis “collapsed and died from suspected dehydration and exposure” after hiking off the trails signposted from the park on Wednesday. A friend who was with him survived and was rescued by park officials.
“[Right’s] A 21-year-old companion from Missouri was joined by Park Rangers and transported by Life Flight air ambulance to Monument Health,” the department said in the statement.
“He was being observed for exposure and dehydration due to hot weather and lack of water,” they continued.
Temperatures at Badlands National Park approached 100 degrees for most of the week, the Expedition of the post of Saint-Louis reported.
In the statement, the sheriff’s office said the two men walked an unmarked trail that was allegedly challenged on social media.
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“The Pennington County Sheriff’s Office reminds the public [to] stay on marked trails and carry enough supplies when participating in outdoor activities,” the department said, adding that the incident is still under investigation.
The sheriff’s office didn’t say whether it thought Right and his friend were participating in the challenge, and PEOPLE reached out to the department for comment.
Friends of Right told the FOX affiliate KTVI that they believe the two men were not participating in a challenge during their hike.
Sheriff’s spokeswoman Hélène Duhamel told the NBC affiliate KSDKComment which the ministry wouldn’t share details about the challenge, but said “clearly it’s out there.”
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“We’ve said it many times, you have to have enough water, water, water,” she added. “But I don’t think people get it and they underestimate the heat, especially in the Badlands.”
The sheriff’s office said law enforcement from Badlands National Park, Life Flight, Wall Ambulance, Rapid City Ambulance and Interior Volunteer Fire Department also responded to Wednesday’s incident.