Damn, I saw the original (now deadened) post about this, and quickly sent him a Facebook message to try to convince him to choose life. Looks like I failed. Such a shame for such a bright mind to end so sadly and suddenly. Rest in peace.
I was apparently the first person on the phone with Princeton police (calling from Canada), while my friend posted the original thread you speak of. It seems he had already begun to hang himself by this time. I somehow wish I could have called a minute or two earlier. And further, wish he had been able to talk to someone about this before it ended the way it did. RIP my friend.