http://www.cnn.com/2005/US/02/26/btk...ion/index.html
So it was his daughter that gave him up. Imagine if she hadn't, they may never have caught this guy. I wonder what led to her suspicions of it being her dad.
I think part of our fascination is that these killers often behave and look just like you and me except that they seem to enjoy the act of killing which is something most of us find abhorrent.