I hear ya... for me, this seems like an impulse/rage crime, or a real psycho. I used to live near this area, and I even worked at a hospital in the general area where Ally worked. It was one of my first jobs out of college... and I went out with this guy (for dinner) one time -- and got a weird vibe about him, so I was just not interested... so I politely begged off going out with him again. He was handsome, smart, great job -- looked totally normal on the outside. But something was really wrong with him. He ended up stalking me and scaring the crap out of me! The hospital's director of security was a friend of mine, and when he found out what was going on, he totally took care of the situation, and I was not bothered again, but I truly feeling scared of this guy (he seemed seriously unstable)... but up to that point it was taken care of, this guy was driving by my apartment at all hours/knocking on my door, calling and saying weird stuff on my answering machine, etc. I was freaked!
So I've been wondering lately if it's something like this happened with Ally... was this a work-related obsession?
Just a thought.