I had heard from Connie Jones (Secretary of the High Energy Physics group) that Prof. Okubo had written a paper with a Japanese colleague. I helped her put it on the arxiv. She wanted me to help him with publishing it.
Okubo left a copy of it in my mailbox. I read it and left a message with Connie that I would like to talk to him. He came by. We discussed the paper, on certain non-associative algebras. Then he said somewhat uncharacteristically that he was very sick. And in pain.