Some of the things people are posting about, and that are in the news remind me of aspects in the very first case I ever followed and posted about from when the disappearance began, through the search and then to the recovery: missing Dru Sjodin, MN/ND.
First of all: the body of Dru was placed in a drainage ditch in a field, near a pipe.
Next: This image of the shack pictured in the photo series below, makes me think that this person could have grown up in the area, and this was a landmark known to him from when he was younger. Someone here said that it probably was a teenage hangout. Notice the message scrawled on the front: Abandon all hope, ye who enter here. That seems like something a teenager would write, but is derived from concentration camp gates (I know, because I have visited concentration camps).
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Image 10/11/12 - near the crime scene) You may have to scroll through.
http://s296.photobucket.com/albums/...n/Jessica Ridgeway -CO-/?albumview=slideshow
The perp. in the Dru Sjodin case, placed her body within the area of his "comfort zone" with familiar landmarks on the land where he lived as a child.
Next, as cluciano posted, could the perp. in this case have been recently or within the last few years been released from prison?
The perp. in the Dru Sjodin case was a tier/level III sex offender who had been released from prison to his home area, just prior to her disappearing.
Also, could the perp. be in construction/remodeling work, where he is able to move about the country.
The perp. in the Dru Sjodin case had jobs in construction/remodeling.
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Just some thoughts.