Hmmm ... might the words, "honey, you aren't rich anymore and I'm leaving" have preceeded the whole thing?
That might have been a factor, but he wasn’t rich to begin with. A couple of hundred thousand a year in the NY/NJ area isn’t a lot.
His title gives me a clue: Executive Vice President - Secondary Marketing. Perhaps he was packaging up junk and selling it as a higher grade.
Not to speak ill of the dead, but he being 59 and she being 37, the possibility of it being a gold digger/trophy wife situation is high.