First of all, this article just makes me terribly sad. I'm sure that the more personal glimpses we get, the more heartbreaking it will be. And with that information, the tragedy will seem that much more.
I agree with others above - the missing jewelry is an interesting piece. If that was evidence the police have, that would be it for McD. However, with most of her remains still missing, that seems unlikely. The idea of a keepsake is sickening, but since so little evidence that we are aware of, I am guessing the jewelry is long gone. It was probably something she wore everyday - maybe even if running. It was probably dear to her because it was a special gift.
I hope part 2 goes into more of what Lauren thought of McD. It seems to me, from the info we've been given, that he was definitely jealous of her.
I will add this - just a tiny oddity I got from the article. Did anyone feel it weird that they hadn't spoken in more than a few days and it took him that long to become concerned? My heart breaks for him, but something about that just seems a little weird to me. Maybe it always has - the fact that from Sunday to Wednesday, no red flags were raised while she was missing.