Though I personally knew Isaac Asimov, what I didn’t know until the other day, was that he died of AIDS.  I’m only about a decade behind this news. His widow Janet Asimov, disclosed for the first time, in her 2002 book, “It’s Been a Good Life”, that Asimov acquired AIDS from a blood transfusion during bypass surgery in 1983.  His doctor advised him to keep it secret.