Rikkitic: Without being morbid about it I do wonder at some of the details. For example, did Hackman's Alzheimer's trap him in the kitchen? Was he unable to feed himself?
From the timeline it looks like she succumbed to the virus and without her to care for him he died some time afterwards. The one mitigating circumstance is that, depending on how advanced the Alzheimers was, he may not have been aware of anything much.