Google Analytics - Revoke access
If you want to delete a domain and undo the link with Google Analytics and Google Webmaster tools, first open the Google Account Settings Page (www.google.com/settings/).
Click on "security" and "account permissions".
Here you can revoke the access for TrafficAnalysis.
Next go to google.com/webmasters.
Click on "manage site", "add or remove users".
Here you can delete the email address firstname.lastname@example.org
In TrafficAnalysis you can delete the domain.