It is believed that he committed suicide due to depression and alcoholism that he had suffered for years.
Robin Williams represents both Adrian Cronauer and Johan Keating to me - the roles he played in Good Morning, Vietnam, and Dead Poets Society - my favorite movies, and my favorite movie characters. I shall end this post by one of my favorite movie quotes. Hopefully it takes you back to that very special movie:
" I sound my barbaric yawp over the rooftops of the world".
Rest in Peace