The company that hired a Colorado man who died when he hit a toll plaza on the Kansas Turnpike says it appears the man was asleep at the wheel.

However, The Kansas Highway Patrol says the cause of the accident is still under investigation.

Thirty-year-old Sergiy Angelchev of Auroro, Colo., died Saturday when his tractor-trailer hit the toll booth on westbound Interstate 70 in Leavenworth County. A passenger in the truck is hospitalized in critical condition.

The toll plaza was not staffed at the time of the accident.

Angelchev’s manager for Eastern Freight Solutions says photos taken just before the crash appear to show him sleeping. He had driven about 955 miles in two days when the accident occurred.

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Associated Press information from: Lawrence Journal-World