The initial post reminded me of these two cryo cases.
(Trigger warning for everyone who prefers not to read about dead and/or frozen people with severe real life problems.)
The first case is quite striking.
The 101st patient of the Cryonics Institute (CI) is an 18-year-old boy who committed suicide by hydrogen sulfide poisoning. He was reportedly "super bright", but suffered from depression.
Very bright, perhaps: http://en.wikipedia.org/wiki/Hydrogen_sulfide#Induced_hypothermia.2Fsuspended_animation
It was User:pdf23ds. Here's the note. Excerpt: