Game of Thrones spoilers: King Joffrey's killer revealed. Unsurprisingly, this article contains spoilers - so don't click and moan after if you didn't want to know. The King is dead: Joff was offed
So ultimately no, whichever situation it was I don't think the Tyrell's killed Joffrey. That besides the fact that its just too obvious. Sansa (and us) are led to this conclusion by Littlefinger (a known liar) presenting all the clues Agatha Christie mystery style. That's not Martin's style and it makes me instantly dismiss the 'easy' solution.eOpnTbl.