The crash killed the 59-year-old owner and a 69-year-old passenger. New York: US safety officials investigating the cause of a Tesla Model S crash that killed two men in Texas last month said on Monday that testing suggested the vehicle's automated steering system was "not available" on the road where the accident occurred. But the car's cruise-control function could still have been in operation, the National Transportation Safety Board (NTSB) said in its preliminary report. The report drew no conclusions about the cause and circumstances of the fiery April 17 crash in a suburb of Houston. The NTSB and local police are still investigating.