Somehow, reading this thread made me think of part of a story from a urban fantasy book.
Man doing the same thing as Gus did to his daughter and had in fact was planning to kill her to keep it silent and move on to the younger daughter. It explained in a flashback of his how he got away with killing the mother to keep her silent many years earlier.
Bunch of the Sidhe find out. They get hold of him, actually go through a whole trial for him and sentence him. Sentence was basicly to put guy in a small section of the Fae realm remodeled to be the place he (repeatedly) did the deed, but scaled so he was the same size as his duaghter in it. A construct was put in that was made scaled to be him in this scenerio....
Length of time he is to be in this realm? The spells will release him from the continuous loop of the event when he is truly sorry for what he has done. In the Fae realm they can keep a mortal alive forever so however long it takes.