An Arizona man was killed – and six other people were injured – in a high-speed vehicular collision last weekend on U.S. Highway 191 near Moab, and authorities are investigating whether impairment was a contributing factor in the accident.

Randy Graymountain, 46, of Fort Defiance, Arizona, was pronounced dead at the scene.

Six people in a second vehicle were initially transported via ambulance to Moab Regional Hospital. From there, five of them were transported to St. Mary’s Medical Center in Grand Junction, Colorado, while a sixth person was flown to Primary Children’s Hospital in Salt Lake City.

The Utah Highway Patrol reported that Graymountain was traveling southbound on 191 near milepost 140 on Saturday, Nov. 18, when his 2015 Nissan Versa crossed the center line into the northbound lane. The northbound driver of a 2014 Chrysler Town and Country attempted to move into the southbound lane to avoid the Nissan, but the Nissan then veered back into the southbound lane, striking the Chrysler head-on at about 5:46 p.m. that evening.

Before the crash occurred, witnesses at the scene reported that Graymountain was traveling at a high rate of speed and passing other vehicles recklessly, according to the Utah Highway Patrol.

The highway patrol says it is investigating whether impairment on Graymountain’s part was a factor in the crash.

Five of the occupants who were in the Chrysler – including a 33-year-old man, a 32-year-old woman, a 6-year-old girl, a 4-year-old boy and a 4-year-old girl – are from Texas. The sixth person has been identified as a 66-year-old man from Syracuse, Utah.

Authorities investigating whether impairment was a factor