My guess is that it is not adultery...that it was probably sexual abuse of the children and the wife reacted to it.
And yes, this is the saddest case. What's more is that the sadistic media and hollywood screenwriters will have this up and running on the life network before the year is out...
Sexual abuse of natural children by their father is rather unusual. Generally it's a stepfather.
Just read the latest update and that's the impression I'm getting. They say in the article it's not infidelity...but they know the motive. And they won't answer questions as to whether it was abuse.
http://www.breitbart.com/news/2006/03/24/D8GI6QAG3.html