I am so sorry this happened to you. As many have said - GET A LAWYER.

I note you said this guy was a contractor for Oracle driving a rental car. Perhaps he was driving in the course and scope of his employment for Oracle - did they perhaps rent the car for him, was he in the country because of work, etc.? Perhaps Oracle is also on the hook here if it turns out that this guy is uninsured or otherwise uncollecatble.... Be sure you tell your atty this possible lead.