A man was killed Friday night after he was run over and killed by a vehicle he fell out of and other vehicles on the Southwest Freeway, police said. The man, identified as William Thayer, 23, was riding in a passenger seat in a Ford pickup opened a passenger door to urinate on the freeway while the vehicle was moving at freeway speed, police said. Thayer, who police said was intoxicated, fell out of the truck around 10 p.m. and was run over by the truck and other vehicles before traffic could be diverted. Police are investigating the incident.