California Code, Business and Professions Code - BPC § 6171.1

Six months and one day following the death of a sole shareholder of a law corporation, the certificate of registration of the law corporation shall be deemed canceled by operation of this section. However, the certificate may be sooner canceled by receipt in the State Bar office of a written request for the cancellation from the personal representative or sole heir of the deceased shareholder or the person to whom the shares passed by will or operation of law following the death of the sole shareholder.