Kirk: "So Bones, I assume my bother Sam dies due to fighting the alien parasite's influence, like the others?"
Bones: "Actually Jim, it appears your brother suffered a lot of overwhelming physical trauma in the last 7 or so years. Truthfully, I'm amazed the man could still stand, much less run a lab. It looks like time finally caught up to him as his internal organs were more like that of a 130 year old man - massive scar tissue on all of his organs, and he appears to have suffered a massive heart attack in the last 5 years or so; and his DNA profile is all over the place, like his genome was being routinely modified..."
[We see Nurse Chapel coming in but QUICKLY and silently turning around and heading back out before either Kirk or Bones notice...]
Kirk: "What? He's only 10 years older than me..."
Bones: "Be that as it may, seems he's been through a lot. What was he doing in these last few years before he moved to Deneva..."
Kirk: "I don't know. We didn't really stay in touch over the last decade or so..."