The following link includes video with mention of a third car that could be involved:
http://ktla.com/2013/04/02/two-dead-in-head-on-collision-in-laguna-beach-2/#axzz2PNZXIDYhhttp://ktla.com/2013/04/02/two-dead-in-head-on-collision-in-laguna-beach-2/#axzz2PNZXIDYh
And they release the full name of the Tesla owner/driver as well..
Gruesome stuff. Sounds more likely that a third car is involved. Could better explain a sudden veering into oncoming. I hope we get the full story. Sad as it is.