Alas, not unexpected, but very sad news. Jack would always post a greetings at the time of the Jewish festival dates, and when that stopped I did rather fear the worst especially when re-reading his last few posts. https://punster.me/serif/viewtopic.php?id=344. I hope he was able to enjoy his last (87th) birthday as much as he could in the circumstances.
Also so sad to hear about his cat Suzi. Perhaps, she is keeping Jack company.
Jack (זכרונו לבּרכה [zee-chroh-NOH luh-brah-KHAH] - May his memory be a blessing)
"I meant," said Ipslore bitterly, "what is there in this world that truly makes living worthwhile?"
Death thought about it.
"Cats," he said eventually. "Cats are nice."
Terry Pratchett, Sourcery