Jon Landau, an Oscar-winning producer of "Titanic," "Avatar" and its sequel "The Way of Water," has died. He was 63 years old. Landau's death was confirmed by Disney Entertainment co-chairman Alan Bergman, who called him a "visionary.""Jon was a visionary whose extraordinary talent and passion brought some of the most unforgettable stories to life on the big screen," Bergman said of Landau. His remarkable contributions to the film industry have left an indelible mark, and he will be profoundly missed. He was an iconic and successful producer yet an even better person and a true force of nature who inspired all