If there is a will, the person named as an executor usually files a Petition to Probate the Will.   If the executor no longer wishes to act as executor, that person may decline those duties.  In that instance, California allows any interested party to petition for appointment.

The main function of estate administration of the representative are to:

collect and manage all assets,

give proper notice to interested parties,

pay debts and taxes owed by decedent,

liquidate assets when appropriate;

and finally, distribute the balance of the assets.