Conspiracy: Philip = Mass Murderer?

[Kedjane]

No, we probably don't. I think he was killed by the Tuurngait. He was taken into the "mind realm" of the Tuurngait, then lost the puzzles and died.

Didn't he send the message to Philip or Mrs. LaFresque telling him/her to destroy the documents? I always assumed this.

Howard wrote the letter, sent it then died? How do you think he died?