My father died when I was 31 (had been married for 7.5 years at that point). I do believe though it was the start of *something* for my H. My dad died very suddenly, 6 days later I was diagnosed with lupus and one month later my mother in law got very, very ill and her prognosis was grave. It was then my H really just felt apart and shut down.
My H was never a yeller and it was then he started getting very upset at the smallest things. He would become unglued about me buying the wrong kind of french fries or some other sort of silly thing.
Looking back I think me getting sick so close to his mom getting sick really hit him had. My H's dad is not well to begin with and all of a sudden his entire family was very ill.
Of course my H and I had communication problems so I don't blame it all on sickness/death but I do think it was a huge part of it all. All the sickness/death I mentioned took place between Oct. and Dec of 2006 and H left in March of 2008.