public function execute()
 {
     // Check permissions
     //TODO
     // Get the contactId parameter
     if (!isset($_REQUEST['contactId'])) {
         throw new InvalidArgumentException('Missing contact id.');
     }
     $contactId = $_REQUEST['contactId'];
     PHPWS_Core::initModClass('intern', 'EmergencyContactFactory.php');
     $contact = EmergencyContactFactory::getContactById($contactId);
     EmergencyContactFactory::delete($contact);
     // Called from AJAX, so just exit with no output
     exit;
 }