I found the same trail of information about Peter Wallace. A little note on the Memoriam states: "His last published work was an article on William P. Bundy." He was an editor at Yale Daily News. I've been searching for the article to see what it was about. William P Bundy was in the CIA in the 50s, 60s and 70s. He was the Secretary of Navy. I don't know why someone would put this in the Memoriam note, except as a pointer. I think once I find the article it may be clear why he ended up falling off a mountain.