Aw, this is very sad. TV Squad says:

You would recognize Jay's voice as much as his face, as he voiced an incredible number of cartoons over the years, including The Hunchback of Notre Dame, Reboot, Spiderman, Teen Titans, Superman, The Mighty Ducks, Gargoyles, and Teenage Mutant Ninja Turtles, as well as a massive number of videogames: World of Warcraft, X-Men Legends, Lionhearts, various Star Trek games, Return to Castle Wolfenstein, and just about every other video game ever made that used a voice. But he had live action roles in TV and movies too, including Lois and Clark, Newhart, The Adventures of Brisco County, Jr., Mr. Belvedere, Twin Peaks, Beauty and the Beast, Eerie, Indiana, Matlock, Murphy Brown, Picket Fences, and The Golden Girls. He was also a Royal Shakespeare Company actor and a singer.

The roles for which I knew him best were as Minister Campio, the protocol-obsessed nobleman who almost married Lwaxana Troi on Star Trek: The Next Generation; as Lex Luthor's man friday Nigel in the first two seasons of Lois & Clark: The New Adventures of Superman, and as the voice of the villainous Frollo in Disney's The Hunchback of Notre Dame. His voice was so rich and distinctive that Jay had seventy credits in just the past ten years (not counting multiple appearances on shows like Lois & Clark), according to IMDB. He even replaced the late Sebastian Cabot as the voice of Shere Khan in Disney's Jungle Book cartoons.

Godspeed, Mr. Jay.