If it was targeted, why kill all four people? Why not just whoever was the target? If the person knew who they were and was at the house before, wouldn't they have known about the other two girls? Why kill just the other four and not everyone?
If it was a jealous ex, why kill all four and not just the girl that was targeted? The fact that they got in and out with no struggle, and killed four people with one knife so quietly no one else in the house was awakened, and the neighbors didn't hear or see anything makes me feel like it was someone more experienced or had this very planned out. Not really some jealous ex boyfriend college kid.
It almost seems like they weren't familiar with the house and didn't realize there were more bedrooms on the lower level. So they just killed everyone in the bedrooms upstairs. Thrill seeking?
It is awful and I feel so bad for all involved. I cannot imagine the pain they must feel.