From the email address registered by LoL/Riot Games and linked to your account name, send a deletion request to: support@riotgames.com.
(For more info, see their good ToS on http://euw.leagueoflegends.com/legal/termsofuse )
Tags for this entry: how to delete my LoL account, delete LoL account, cancel LoL account, delete league of legends account.
URLS:
http://euw.leagueoflegends.com
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.
There is faster way. Just login to your account at leageofleagends.com, then go to account settings. Then open notepad, write about 24 random letters and numbers. Copy it. Then go to change password settings, enter old password and then paste password from notepad twice. Go to your mail and copy confirm code. Log from lol site. And your account is deleted.