I think the hypothesis is that RH evolved toward lengthy torture of his victim in his house when the family/wife/mom was away. Source: Ray Tierney’s last two press conferences.Just butting in here bc something that has been bothering me is the part in the document about "body wash". Was this done at home or ? Were they being held captive in the house? Sorry if this is well known info, I'm not up to date.
As an architect living in a hoarder house, he must have understood how hard it would be to get rid of their hair etc in a meticulous fashion. So possibly he hosed them down elsewhere, maybe in/using the avalanche.