Sounds like he'd been battling cancer. Always laughed when he talked about stuff related to his Dad.
RIP
I read where his publicist said it was a form of Non Hodgkin's Lymphoma.
There is one form of it that is incurable (6% occurrence of all NHL) and can either be indolent/slow growing (10- 30% of those diagnosed with it) or aggressive. If aggressive 4-6 years is a good run. Indolent they don't know yet but say 7-10 years or longer.
bob