This is the 1905 page-long suicide note written by Mitchell Heisman.
It is also available at http://www.suicidenote.info/

Go ahead and download from there and keep the seed alive. It's only 4.25 MB, so you can keep it seeding indefinitely if you want, and I think it's worth sharing.

He had a degree in psychology and the work is extensively fleshed-out and contains many citations. It can be regarded as a philosophical work.