Board Thread:False Info and Speculative Discussion/@comment-4467206-20140725161311/@comment-76.68.119.86-20140726030225

Actually, the keys have been the names of main deceased characters that had a strong connection with Lydia.

E.G

Allison was Lydia's best friend.

Aiden was Lydia's boyfriend.(Not for long though)

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I think the next Key is Stiles, although he didn't die, VOID stiles died. (Season 3b Finale) Stiles also has a connection with Lydia.

If it's not Stiles, I think it's Jackson. Jackson was killed as the Kanima after Lydia gave him his key. But he came back as a Werewolf and moved to London.

In conclusion, I think it's either Stiles or Jackson.