In the case where the owner of a property has died without leaving a will, the fiduciary appointed to represent the estate is known as a/

is known as an administrator

Explanation:

If the person has passed away and while he was alive did not appoint anyone or made any will with regard to who will take care of his affairs, the Probate office or Register of Wills office will choose an administrator for that person who will look over this person's estate.

This is commonly taken care of in the state and county where that person use to reside which has the right to select an administrator.

The way that this is done is they look at the available family members who are closest to the deceased , like the person's spouse or the older child who can then be selected as the administrator.

If no close relatives are found the responsible offices can choose a distant relative or even a stranger to be an administrator especially when they also see that they may be conflict that may arise with choosing a certain relative.