Wow, that’s a shame. I really enjoyed his novels. I kinda lost track of his writing after Jack Ryan turned into a “Super Hero” but the early stuff (through Executive Orders) was so good.
One of the best novels I’ve ever read to this day has been Without Remorse.
Damn, he was only 3 years older than me. I loved his novels as well although like you I stopped reading them after Jack became president. When I first read Hunt for Red October I was amazed at all of the information in there that I had access to through classified documents was written in a novel. That hooked me. Great writer.
I really liked The Cardinal and the Kremlin and thougt it had by far the best character development of all his books....but I read and enjoyed every book in the Ryan series.
My only regeret about his career is that he let Hollywood change the villians in The Sum Of All Fears from Islamists to Americans. I don’t know if he could have stopped that, but if so, he should have fought for it.