An Oklahoma man died after falling off a pickup truck at a Buffalo River, Okla., campground on Saturday (July 27), according to ABC 7. 

According to the National Park Service, 54-year-old Troy Roderick of Cushing, Okla., had been at the swimming area near the Ozark Campground. Just after 5 p.m., while going back to his campsite, Roderick fell off the tailgate of a truck he was riding on and lost consciousness.

The park service cautioned visitors to not ride on any portion of a vehicle that’s not designated for passengers, even at slow speeds.

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