DENVER, May 3 (Reuters) - A Texas truck driver who police say caused a fiery multi-vehicle crash near Denver last week that killed four people and injured four was charged on Friday with 40 criminal counts including vehicular manslaughter, prosecutors said. Police in Lakewood, Colorado said they arrested 23-year-old Rogel Lazaro Aguilera-Mederos after he lost control of his tractor-trailer truck during the evening rush hour on April 25 and caused a crash on Interstate 70 that involved at least 28 vehicles.