Lots of things at play...did the driver have a medical issue? If so, does that mean he's not liable for the damages/injuries caused? The latter depends upon the state. Also, did he have on-track coverage for his car, and if so, what coverages did he have? Did the SCCA have coverage for the event? Did the property owner have coverage, and if so, did their coverage allow them to loan/rent out their property for this event?

The only thing I'm certain of is that the estate of the poor woman that was killed will be collecting $$ from anyone who is collectible.