User blog comment:Filheinz/What has Yorick done?/@comment-5727129-20130704193327

Yes, it does game-wise point to Yorick. Yet it does not make much sense lore-wise, because we know that Yorick is a rather peaceful person, the fountains on Twisted Treeline address him as "poor yorick". I would be surprised if he is the killer.

The other characters that I can think of are Karthus and Aatrox, or someone completely new. I don't think the teaser points at a person from the Shadow Isles completely, so it could be anybody that has the possiblity to live after death, like Sion, who may have his lore changed along with his rework.