I don't like how whenever there is a suicide, the possibility of being suicided (somebody else making it look like a suicide with the intent to discredit and kill) is never suggested, considered, and is even looked at as conspiratorial paranoia. Of course in this case there are 3 letters left on the scene, which (if convincingly written by him) would be good evidence pointing toward legitimate suicide. I would like to see video/witness evidence, more investigation into events leading up to the death, etc.

The only reason I suggest it as a possibility is the fact that he was highly passionate about important, controversial research. I would think that he wouldn't want to commit suicide because of this and that other people would be out to get him. His work is now being dismantled and he is dead, which is a big win for people that did not like what he was doing, and clearly a tragic loss for everything that he believed in.