Someone correct me if I'm wrong, but this is what we have so far, if I remember right: Riku and Nui's room for one crime scene, the bonfire for another, the Sheriff's Station for a third. If you want to count it, the disposal hole could be a fourth.

Don't think we have any definite leads connecting one scene to another.

[But there's been a lot of discussion and he could've missed something, so?? also jan's tired]