Reporter an unfaithful husband. But was that the motive for murder . Police learned this case was far more complicated than that. And this mystery, not so easy to solve. She grabbed his throat. I dont think she realized what she was doing. He couldnt take it anymore, the entire situation. It was just heartbreaking. Reporter tonight, the troubling truth about the family next door. Im lester holt and this is dateline behind closed doors. Heres dennis murphy. Reporter it was a drippy friday morning, the start of memorial day weekend. Bernie pyne usually took that day off from work for a welcome seasonal chore, getting the backyard pool cleanedup, the unofficial start of summer at his familys home in michigan. He told his wife, ruth, it didnt make sense though, what with the weather. I remember that morning, i said, hon, im not going to open the pool today. Its kind of soggy out there. Theres no sense wasting a vacation day on a day reich this. Reporter so bernie took off for his job as a