A Granby, Colo., man died in a motorcycle crash south of Riverton on Thursday, according to a news release from the Wyoming Highway Patrol on Friday.

John Bass, 62, was riding a motorcycle north on Wyoming Highway 135 when it left the road to the east in a left-hand curve about 25 miles south of Riverton at 1:20 p.m., according to the news release from Patrol Sgt. David Wagener.

After leaving the road, it struck a delineator post, tripped and crashed.

Bass, who was wearing a helmet, was thrown from the motorcycle. He was taken by ground ambulance to SageWest Health Care Hospital in Riverton where he died.

Driver inattention is being investigated as the contributing factor in this crash.

This marked the 69th highway fatality in Wyoming for 2016. There were 92 fatalities during this time in 2015.