CA Elec Code Section 8204

(a)

If an incumbent of a judicial office dies on or before the last day prescribed for the filing of nomination papers, or files a declaration of intention but for any reason fails to file his or her nomination papers by the last day prescribed for the filing of the papers, an additional five days shall be allowed for the filing of nomination papers for the office.

(b)

Any person other than the person who was the incumbent, if otherwise qualified, may file nomination papers for the office during the extended period, notwithstanding that he or she has not filed a written and signed declaration of intention to become a candidate for the office as provided in Sections 8023 and 8201.