California Code, Government Code - GOV § 1771

(a) When an officer is removed, declared insane, or convicted of a felony or offense involving a violation of his or her official duty, or when his or her election or appointment is declared void, the body or person before whom the proceedings are had shall give notice thereof to the officer or body empowered to fill the vacancy.

(b) When an office becomes vacant pursuant to subdivision (m) of Section 1770, the local agency on which the vacancy occurs shall give notice of that vacancy to the officer or body authorized to fill the vacancy.