In the Terms you are advised to just ‘leave’ the site. No deletion. However, you may try to contact an admin on the forum and then there may be a small spark of hope. See e.g. http://cghub.com/forum/showthread.php?t=4853
Please note that AccountKiller.com is not associated with the business listed on this page. AccountKiller provides easy-to-understand instructions and guides on how to cancel charges and relationships from the list of businesses on our site, we have no affiliation with these businesses.