I'm new to posting here, so while I've tried to keep up with everything, I apologize in advance if I go over previously-covered material. So here goes: in my twenties I graduated from a rural university, hundreds of miles from any large metropolitan area. I'm thinking the cultural dynamic was the same there as it is in Moscow--an island of happy-go-lucky students with bright futures amid a sea of economically-depressed agricultural workers, some of whom have serious resentment toward the students. So I'm thinking the killer is one of these locals who uses a hunting knife in his daily activities. He's pretty clearly a single male, perhaps who only comes to town on Saturday nights in Moscow to seek female companionship. Since it's been reported that on the night of the murders K and M were at a bar from 11 until 1:30am, I can easily imagine him sitting a corner of the bar drinking by himself while observing K and M as they have a great time with all their friends. Maybe the killer had seen K and M on the other Saturday nights at the same or other bars in Moscow. And I can easily imagine him having approached one or both of them at some point with romantic intentions and having those intentions spurned. So on the night of the murders, the killer follows K and M out as they exit the bar and watches them from his own vehicle as they wait for their ride. Once they've been picked up, the killer follows at a safe distance until K and M are dropped off, at which point he waits in his vehicle. He sees K and M enter the house. The downstairs roommates are already asleep, so their bedrooms are already darkened. It's not clear which of the murder victims arrived home first, X (and the visiting E), or K and M, but regardless the killer has targeted either K or M or both. So the killer waits for literally hours in his vehicle until lights are out, and he can reasonably assume that everyone inside the house is asleep. It's clear that he would have had to enter through the sliding glass door, and I'm thinking at this point he knew K and M were on the third floor, so he goes there first and murders K and M in their sleep. On his way out, perhaps he encounters E and X who have heard something suspicious. He murders them with greater difficulty, but completes the job nonetheless. So I think it's E's body who the surviving roommates have seen "unconscious" before making the 911 call the next day (it's not clear from reports if all or only some of the victims were murdered in their bedrooms). Regardless, the killer has escaped before dawn, and I think he would have taken the murder weapon with him since it's his prized hunting knife. These sorts of "motiveless" crimes are always the hardest to solve, since there are no traditional suspects. IMO it will take exhaustive DNA tracing to find the killer.