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Trevor T. Trujillo, Townsquare Media

JACKSON Wyo. (AP) — A man has died after a couple's car drove off a road and into a river in western Wyoming.

The accident happened around 1 p.m. Friday on U.S. 26-89 through Snake River Canyon.

Wyoming Highway Patrol Trooper Mike Merritt says the surviving passenger believes her husband fell asleep before he swerved, hit a guardrail and went down an embankment into the Snake River. Merritt says two fishermen heard screaming and saw the woman standing waist-deep in the water.

He tells the Jackson Hole News & Guide alcohol isn't thought to be a factor.

A search and rescue team recovered the man's body. He was pronounced dead at the scene.