COF88 has an interesting post. I also think the murderer operates in his comfort zone and trolls the area through living there or working. He may even live in the area because this is the type girl that he fantasize about hurting. I've wondered if he might do drugs or alcohol since he was probably making a lot of noise trying to get into the previous victim's door. That wasn't a very smart thing to do. Letting her go, threatening her, then coming back wasn't an organized type crime that would suggest he's one of those organized uncatchable serial killer types.