jmw - I can't quote the chapter and verse, but I am fairly sure that more than one poster has noted an earlier 'episode' or uncompleted crisis.
My h had a kind of breakdown - a period of severe depression around the time of my father's death 20 years ago. Curiously I believe it was my mother's death that trggered his full blown MLC - he was MUCH closer tomy parents than his . . .
I think many signs are there in these damaged people, but we keep them going . . .