Brett T. Arnes, 35, of Ellensburg, crashed his red pickup at about 4 a.m. just west of Snoqualmie Pass, the State Patrol said in a news release. The westbound car crossed the median and the eastbound lanes before stopping against a guardrail.

Arnes then took off his clothes and stood in the second eastbound lane, the State Patrol said. A white pickup ran him over.

Trooper Kelly Spangler said no charges were pending against the driver of the white pickup, Erick Hanson, 60, of Wilkeson, who was on his way to work. Hanson was not injured, but was very upset, she said.

Arnes had been a McDonald's franchise-holder since 1996, said McDonald's spokeswoman Cheryl Lewis in Kirkland. He owned franchises in the Eastern Washington cities of Ellensburg, Quincy and Ephrata.

Spangler said investigators have no idea why Arnes removed his clothing. Temperatures at the pass hovered around freezing at daybreak, hours after the accident.

To add to the mystery, a dead dog was found near the truck. The dog's carcass straddled the two eastbound lanes nearest the shoulder of the highway, Spangler said. Authorities did not know if the dog belonged to Arnes.