One person was killed Thursday morning in a one-vehicle crash east of Spearfish.
Authorities say a pickup was traveling westbound on Interstate 90 when the vehicle went off the road to the right, collided with a guardrail and entered the north ditch where it tipped and rolled.
The 39-year-old driver was thrown from the vehicle. He was not wearing a seat belt.
The 39-year-old later died at a Spearfish hospital.