cause. there would be a probe into the deepest roots of a treachery beyond most people's comprehension. >> it's not true. no way. >> what had they all missed? >> a monster. a liar. a cheater. >> he's destroyed my entire family. ♪ >> before it became charred rubble, the house was home to a long-time paducah couple, keith and julie griffith, church going, golf playing, high school sweethearts, 36 years into a marriage that had produced two sons. aaron the older. >> they were very supportive parents. they were loving. they loved my kids. >> aaron took after his dad, athletic, easy going, level headed. younger brother zach was more of a firecracker like his mom. there was the time, for instance, in the sixth grade zach grabbed a shovel and