The cause of death has been released for a San Diego firefighter who was killed while battling the massive Thomas Fire raging in Ventura and Santa Barbara counties. Cal Fire San Diego Unit Fire Apparatus Engineer Cory Iverson died from thermal injuries and smoke inhalation, an autopsy performed Friday found, according to the Ventura County Medical Examiner Office. Ventura County sheriff's officials said the firefighter suffered fatal injuries near the eastern flank of the fire sometime between 9 a.m. and 10 a.m. Thursday. The department's major crimes division was investigating the death.