Section 8504 Of Article 6. Removal From Office From California Probate Code >> Division 7. >> Part 2. >> Chapter 4. >> Article 6.

. (a) After appointment of an administrator on the ground of intestacy, the personal representative shall be removed from office on the later admission to probate of a will.
  (b) After appointment of an executor or administrator with the will annexed, the personal representative shall be removed from office on admission to probate of a later will.