If someone steals your car and kills someone with it, then disappears without ever being identified, the car owner doesn’t assume liability. Liability falls on whoever was operating it at the time. If software was driving, then the software company assumes the liability.
You treat it like any other traffic accident, except if a self driving car is responsible, that responsibility lies with the vehicle’s owner.
It would have to be the manufacturer.
If someone steals your car and kills someone with it, then disappears without ever being identified, the car owner doesn’t assume liability. Liability falls on whoever was operating it at the time. If software was driving, then the software company assumes the liability.