Incredibly sad news. I don't have much to add but to share some of my favorite work by him, one is an essay exploring Jaynes idea of the Bicameral Mind, and another is a talk he gave on Ontology and Philosophy of Science. Always admired his ability to bridge disciplines and look at ideas from a slightly unorthodox angle.
https://www.youtube.com/watch?v=Nx5OZ1AZ5Vk
https://www.julianjaynes.org/pdf/dennett_jaynes-software-arc...