Cal. Bus. & Prof. Code § 6180.1
The notice shall contain any information that may be required by any order of disbarment, suspension, or of acceptance of the attorneys' resignation, by any rule of the Supreme Court, Judicial Council, or the State Bar, and by any order of a court of the state having jurisdiction pursuant to this article or Article 12 (commencing with Section 6190) of this chapter. It shall be mailed to all persons who are then clients, to opposing counsel, to courts and agencies in which the attorney then had pending matters with an identification of the matter, to any errors and omissions insurer, to the Office of the Chief Trial Counsel of the State Bar and to any other person or entity having reason to be informed of the death, change of status or discontinuance or interruption of law practice. In the event of the death or incompetency of the attorney, the notice shall be given by the personal representative or guardian or conservator of the attorney or, if none, by the person having custody or control of the files and records of the attorney. In other cases, the notice shall be given by the attorney or a person authorized by the attorney or by the person having custody and control of the files and records.
Ca. Bus. and Prof'l. Code § 6180.1