College students are smart enough to lawyer up, especially the type that can afford to be in a fraternity.I don’t think the killer is a student. I don’t believe any roommates or ex boyfriends are involved. I say that because those types have certainly been interviewed by now. They would have cracked. College students, from the suburbs, aren’t able to withstand an hours long interview, with a hardcore, tough as nails homicide investigator, and maintain composure.
I think this is going to turn out to be someone within their sphere, not necessarily a student but possibly someone that one of them had interacted with in some way and he became obsessed.
Something not mentioned is that Madison and Kaylee looked a LOT alike. It is possbile the killer targeted one of them, killed the wrong one, realized his mistake then went for the other. Maybe Ethan heard something, got up to investigate, and was killed. Xana heard the struggle, screamed, and he went after her. This does not fit the "all found in bed" statement but I don't think that is 100% correct because there are pictures of blood running down the outside wall of the house. Seems unlikely that would happen if he were on a bed.