Hold on for a tick, this might change everything.
If this man knew of injuries, esp. critical ones, and said nothing -- and IF THE COPS DID NOT KNOW OF THEM -- then this guy would definitely be guilty of the Good Samaritan laws that have popped up everywhere, including California.
However, it should not factor into a Vehicular Homicide case. Only his driving actions should be introduced to demonstrate 'depraved indifference to human life'.... NOT his failure to speak...... otherwise this becomes a very ugly precedent.
If it’s my daughter dying in a car and this jerk knows it and doesn’t speak up, then why do I feel justified in shooting his sorry ass? After all, he didn’t confess to me.