Announcement here. It happened August 13th but I've just started browsing the net for any length of time today, so.
It's not unexpected since he was in his 70s or 80s, but it's still sad.
When a 16-year old me sent Tony Jay a slightly gushy fan letter, he actually took the time to write back with a very kind reply, thanking me for my fan mail and commenting on a few things I'd said. It was the first time I'd ever written to an artist I'd admired, and I was both amazed and ecstatic he'd written a response. It sounds cheesy, but I'll never forget that feeling.
When I began watching ReBoot and decided that Megabyte was just about the coolest, wickedest bad guy ever, it was 90% because of Tony Jay's voice. I started noticing how many cartoons and videogames he showed up in. He was in a lot of good stuff - ReBoot, of course, but also Planescape, Fallout, Mighty Max, The Tick - and he was always a treat to hear. Tony Jay was a great actor, and the first to make me realize just how much an animated character's personality was at the mercy of its voice.
You'll be sorely missed, Mr. Jay. Rest in Peace.
Addendum: I took a quick look around some of the old ReBoot fan websites I used to hang around to see if the news had spread and found this. It actually has some sketchy details of what season 4 was meant to be, from Gavin Blair himself, and may have a few more coming.
As much as I bitched about the 4th season, I'd love to have a script of the missing episodes. They didn't stand a good chance of being made before, and after Tony Jay's passing away that chance has gone down to zero, but my curiosity dies hard.