So he admitted causing the crash? I thought he had said it was the woman's fault.
If he has indeed done a runner, and it is to Cambodia, I doubt they would send him back due to current strained relationship with Thailand, but he will be there illegally, and without a passport.
If he hasn't, and the Police have his passport, he is in a whole lot of doodah. i doubt paying THB 30,000 to the family will help his case much.
Causing the death of aThai mother of two children in the way he did, and the local understandable outcry is likely to ensure some time served, but I doubt he will get the maximum.
Last holiday to Thailand for him though.