On the day before, he had talked to her about their future. If he died tomorrow, he had told her, everything was taken care of. The estate was in order. We've all heard stories like that. Stories that also make you wonder if people have premonitions of death.
Doctors see it all the time.
They sense their bodies failing, but not enough to seek help. Intuition kicks in, and they begin to set their priorities straight. When he was able to retire in his mid-50s, he gleefully moved to the country. And he promptly died. When we're young, abrupt changes are exhilarating, the sign of a life being fully lived.