I wondered, way back when, as well, OldSteve. My theory was that Nick had prolly taken her out back to show her where he "lived," and she got antsy, scared, or whatever, and IT started & ended right there.
I figured if there had been any blood or other fluids, they would have been spilled on the ground & not a floor, etc., or perhaps spilled on a blanket or sleeping bag. Easy enuff to hose-off the area & let rain do the rest and/or to toss the blanket or sleeping bag in a dumpster. Wham-bam, the evidence is down the drain, STS, or in the landfill within hours or days. Gone.
If that is so, I'm sure NH thought he was smarter than the average LE. But look where he is now..
Take a bow, PI. We thank you. What a hero! (This is NOT to lessen one bit all those hours that LE has, and will, put into this case.) It's just as others have alread said -- the PI can and did do things that LE cannot. Pile up the PI's huge contribution of time, effort and smarts, with the LE's efforts and we have what sounds like a good solid case to take to a jury -- if that's the way NH wants it to go. Be careful what you ask for, Nick Holbert...