ยง 6512. Service of summons. A notice of pendency is effective only if, within thirty days after filing, a summons is served upon the defendant or first publication of the summons against the defendant is made pursuant to an order and publication is subsequently completed. If the defendant dies within thirty days after filing and before the summons is served upon him or publication is completed, the notice is effective only if the summons is served upon his executor or administrator within sixty days after letters are issued.