Bravo! That's a good possible explanation of the mechanics of the execution. I went back and viewed the portion dealing with the forensics report - and (this is the part that didn't stick in my memory) - you're right - he does say that the killer likely cleaned her up BEFORE they set out for the woods. And they did find traces of ether in her liver - confirming the sedation.
The only part I still have a little trouble with is that he needed to wear the necklace expressly for purposes of the killing, and never else (and therefore wasn't ever seen before by the Larsens or his co-workers). But with the other things coming together - I'm going to set that aside for the greater good.
So I guess - he had her in the basement for a couple of days and had his way with her, needed to eventually get rid of her, so he sedated her, did the sterilization, and dumped her in the car and headed for the woods. He parked in the woods, opened the doors to get her out, but maybe she had come to by then, and made a break for it, leading to the chase. He recovered her, probably either hauled her back to the car and trussed her up (or trussed her up and hauled her back) - during which the necklace got ripped off and she hung on to it. And as you say - if he was in his poncho and stuff - she probably didn't get a good enough grab at him that was worth anything forensically. And then he shuts the door and maneuvers it into the lake.
Thanks for the good discussion. I'm glad to have gotten that out of the way.
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