Joe Barbera (of the Hanna-Barbera team) died Monday at 95. With his partner, they created Tom & Jerry, and the whole H-B line (Flintstones, Jetsons, Yogi Bear, Huckleberry Hound, Scooby-Doo, Jonny Quest, etc.).
And it was just announced that Chris Hayward, one of the writers for Bill Ward and the Rocky & Bullwinkle team (as well as being one of the creators of The Munsters, and a writer on numerous TV shows, including Barney Miller and Get Smart), died back in November.