California Code, Elections Code - ELEC § 2205

The local registrar of births and deaths shall notify the county elections official not later than the 15th day of each month of all deceased persons 16 years of age and over, whose deaths were registered with him or her or of whose deaths he or she was notified by the State Registrar of Vital Statistics during the preceding month. This notification shall include at least the name, sex, age, birthplace, birth date, place of residence, and date and place of death of each decedent.

The county elections official shall cancel the affidavit of registration of the deceased voter.