Haven't they been together for a while. I read they were just recently on vacation and things appeared fine. It is sad when one person goes crazy for whatever reason and decides to commit murder/suicide as the answer.
There have been stories about how people had happy marriages, and one day the husband or wife flips out for no reason and attacks their spouse. I was watching a documentary about a lady who was a former prison guard, but one day she just lost it and killed her husband because he was annoying her.