I'm coming out of lurkdom too. This case is a real puzzler, but I have no doubt that Morgan was stalked.
I am reading posts where people say the stalker's behaviour makes no sense, etc. But stalkers don't think the way a normal person does. I was stalked by a neighbour for five years- everything I did to try and stop him, make him back down, only escalated the behaviour. I swear he got a thrill every time the police showed up to talk to him. So I can easily see Morgan's stalker getting a thrill watching LE come and go, and not catching sight of him.
Stalking does wear you down- it's truly horrible, you never get a minute's peace and it totally changes the way you view the world. I just feel terrible for Morgan and her family, because I know how it feels to live with that 'siege mentality' constantly. Also, the stalker may be so surreptitious that it's only really the person being stalked that knows just how bad it is.
I'm not sure what I think just yet about how she died, but it does make me think of the Chris Jenkins case where LE insisted it was suicide or that he had stumbled into the river and drowned himself- but he hadn't, he had been murdered. Some very strange things happen, that look rather innocent or obvious on the surface, but in truth they are anything but. So I'm reserving judgement.