Johnson was one of four people traveling in a Jeep late Saturday evening on BLM Road 1069, about 30 miles south of St. George. Mohave County sheriff's spokeswoman Trish Carter said the Jeep, believed to be traveling at a high rate of speed, left the roadway and rolled, ejecting Johnson. He died at the scene.
The driver, Brayden Oaks, 18, of Washington, Utah, and Jace William Graft, 20, of Ivins, were taken to Dixie Regional Medical Center for non-life threatening injuries.
Carter said that while speed appeared to have been a factor, alcohol was not.
The accident remained under investigation Monday.
Mcelyea died Sunday near southwest Snow Canyon State Park. Utah Highway Patrol Sgt. Jacob Hicks said an ATV was following Mcelyea's dirt bike southbound on Spanish Trail Drive at about 5 p.m. when Mcelyea stopped near Interstate 15 northbound and the ATV struck the rear tire of the motorcycle — causing the ATV to roll and the bike catapult.
Mcelyea — despite wearing a helmet —was killed on impact.
The 27-year-old ATV driver,of Brookside, Utah, escaped with minor injuries.
Hicks said the ATV driver was booked into Washington County Jail pending results from blood toxicology tests. He was being held Monday in lieu of $5,000 bail.