RAPID CITY - Authorities are investigating separate accidents that killed two men in western South Dakota.

The Highway Patrol says 40-year-old Kenneth West from Virginia was killed Friday north of Quinn when the pickup he was a passenger in rolled when the driver missed a curve. Three other people were injured.

On Saturday in Rapid City, 79-year-old Lloyd Roscamp was killed when his car collided head-on with a semi on Interstate 90 after he entered the westbound lanes going east.