PUEBLO COUNTY, Colo. -

Investigators are trying to figure out what caused a crash that killed a man on Highway 78 in Pueblo County Friday night.

A witness reported the crash to the Colorado State Patrol around 9:30 p.m.

A 29-year-old man from Divide missed a curve 9 miles north of Beulah. The driver hit the guardrail and rolled his car.

The man was ejected and died.

Troopers have not released his name. They said the investigation remains open.