California Code, Elections Code - ELEC § 7410

In the event of the appointment or election to a committee of an ineligible person, or whenever any member of the committee dies, resigns or becomes incapacitated to act, or removes from the jurisdiction of the committee, or ceases to be a member of this party, a vacancy exists which shall be filled by appointment by the committee in which the ineligibility or vacancy occurs.  A vacancy shall also exist on a committee when a member is removed from the committee pursuant to Section 7411 or 7413.