Case Owner
A Case Owner is typically the user who created the Case in the first place
However while creating or editing a case, the Case Owner can be set as a different user.
The other role that a user can have on a Case is Case Worker
Unless otherwise specified, the only users with permission to close or edit a case are
the case’s Case Owner
the Project Manager(s) of the project that the case belongs to
the Organisation Admin(s) of the organisation that owns the project that the case belongs to