I would try texting him.  My friend texted him and Bob's son replied on Bob's phone.
On 06/14/2023 7:02 AM EDT Christian Liendo via vcf-midatlantic <vcf-midatlantic@lists.vcfed.org> wrote:
 
 
This is sad, he was a great guy. He not only did great work, but he
was a good person.
 
I have his Kim-1 memory and I/O board.
 
I will keep my eye out for an obituary, But if anyone knows someone
in his family, please let them know that we as a community send our
condolances and will miss him.