Removing an account is a permanent operation and cannot be undone.
To delete an existing admin account:
Click Settings → Admin accounts on the menu.
Select the account name you want to delete on the Administrator account information page, and click it.
On the Edit account page, click Delete. You will be asked for confirmation. Click Yes to proceed with the deletion.
An alternative to deleting an admin account is disabling the account by selecting none as the authentication set. This way, the link between the user and the audit log information is not lost. See Configuring Extended Admin Authentication.