Cal. Veh. Code § 17452

Where the nonresident has died prior to the commencement of an action brought pursuant to this article, service of process shall be made on the executor or administrator of the nonresident in the same manner and on the same notice as is provided in the case of the nonresident. Where an action has been duly commenced under the provisions of this article by service upon a defendant who dies thereafter, the court shall allow the action to be continued against his executor or administrator upon motion with such notice as the court deems proper.