It also to me once again reveals how useless the old trope is that murderers or serial killers/abusers behave differently once they have killed and LE always says look out for someone whose behaviour changed post the murder. Most murderers do not reveal anything post the crime, we have heard time and time again they are just the normal average person who commits an horrific (or series) of horrific crimes and goes back to his life as if nothing had happened.
He was married when he committed his crimes, he was married for 20 years to his last wife (who has spoken to media) who has obviously left him and is as horrified as everybody at what he did, she knew nothing of his crimes.
Unfortunately for us they do live amongst us and are able to keep the deep darkest desires and secrets to themselves.
One thing I will say is that serial killers abusers (from what I have observed, I have no specialist knowledge of psychology or behaviours) tend to pick partners who (again from observation and reading about cases) who are not overly curious and seem to accept what he tells them at face value.
This case and BTK reveals that in both cases they had huge amounts of trophies, evidence of their crimes in their homes, which neither wife knew about. I would have been in all his business, his office would not have been off limits to me so I would have found all his **** from day 1, seems the predators are able to pick partners who just let them keep all their stuff private and don't go looking. My red flags though would have been waving (if it is true) when he put CTV in his office.