If i could chime in here. there has been some discussion in the thread about the grave and depth vs time and weather conditions that evening. this may have been mentioned already but its quite possible that he dug the grave prior to the camping trip. i dont believe for a minute that this was a "crime of passion". he planned this for a while before acting. a pre-dug grave would fit in well with the timeline if this is Susan. several hours to get there, a couple hours to prepare the remains and cover with dirt, then back home several hours later. 8 hours round trip maybe.
As an aside, as much as i love my fellow posters, i cant escape the childhood superstitions of JINXING something by claiming to know for sure or have a gut feeling or any other definative conclusion of recovered remains identities. having been on this site for a while, i think many of us have experienced examples of this. I know it comes from a part of us that really wants to have answers to troubling cases, but i still shake my head everytime i read these proclamations. Dont bite my head off though, i really hope this is susan too.