--- mail_ru_auth.finalize.inc	2010-08-25 18:41:30.000000000 +0100
+++ /var/www/multisite/www/sites/all/modules/mail_ru/mail_ru_auth/mail_ru_auth.finalize.inc	2010-10-12 12:51:30.000000000 +0100
@@ -180,6 +180,11 @@ function mail_ru_auth_finalize_user_form
     if(variable_get('user_pictures', 0)) {
       $avatar = _mail_ru_auth_save_remote_image($photo, $account);
       $array['picture'] = $avatar;
+      
+      if($array['picture']){
+        //remove previous avatar file
+        file_delete($account->picture);
+      }
     }
   }