Comics artist and creator of Batman's arch-nemesis, The Joker, Jerry Robinson has merged with The Infinite.
There are fact-filled eulogies and appreciations drifting in from all over the internet, so I'd rather link to better-written and better-researched articles and eulogies.
Jerry lived to the age of 89, but in his youth was part of the comics explosion, working side by side with the pioneers and greats of industry. He was also a comics historian, and advocate for creator's rights.
With the production of The Dark Knight as a major film (and featuring The Joker), Robinson was given emeritus status at DC Comics, and has enjoyed a close relationship with the company the last few years.
Another of the great ones has passed.