It looks to be suicide.
I was a fan of Richard's since his stand-up specials back on Showtime. And after that, I was hooked. Followed his career through the HBO specials and then his small stand-up stuff for Coke that you'd see run before films in the late 90s.
I haven't really collected my thoughts on this whole thing. I'm sad as all fuck because of it though. In the world of Comedy, he was my U2 - if that gives you any idea on how much I liked the guy. I guess I'll just leave with some links:
Collected quotes from Wikipedia
YouTube - Jeni on PMS & Boobs - 6:00
YouTube - Jeni on Politics - 3:00
YouTube - Jeni On Martha Stewart - 2:30
YouTube - Jeni on Jaws 4 - 4:00