All IMO
I agree with this - someone that knew her by interaction, and enough to know where her room would be from either living close or being there at a party. But I don’t think it was a friend of even acquaintance. While it may not have been a stalker specifically, I think it was someone that was obsessed with Kaylee. This was his last opportunity to ensure that she could not “leave” him. In his head, that meant killing her. I also do not think he initially intended to kill anyone outside of her but it didn’t go as planned.
24 hours ago, I would have never thought the killer was already in the house, but with the information, or lack thereof, I believe he was.
In my opinion, I think the following occurred.
-The perp saw the social media post that Kaylee was back in town and knew they we all going out.
-he uses that as an opportunity to get into the home, goes into Kaylee room at waits.
-they all come home, potentially hang out together and eventually Madison and Kaylee come up to bed. This is where his plan goes sideways.
-I believe as friends do when drunk and knowing this is one of the last college nights they’ll have together, lay in bed together, talk, call J, and eventually fall asleep in the same bed together.
-While he only had Kaylee in mind, this is last chance and he decides to kill both Madison and Kaylee. I would not be surprised if Kaylee had more stab wounds than the others.
-Xana and Ethan are asleep, but one or both are awaken by the noise (I believe Kaylee’s room is directly above).
-The killer needs to go through the kitchen to leave through the slider, and I thought Xana’s room was next to the kitchen. As he attempts to leave the premise, either Xana or Ethan is out of bed, with the door open looking out to see what is going on, and sees the killer.
-He then turns on that person, who I think is Xana and attacks her - thus the defense wounds reported by her father.
-I think he then turns on Ethan who would likely be trying to understand what is going on as he is drunkenly sleeping.
-He then exits the residence through the slider, quickly - this leaving it unlocked.
I’ve been wracking my brain about who could do this, and more importantly why. Serial killers, drug dealers, ex-boyfriends, random psycho, grudges, etc just don’t fit in my opinion. But in my opinion, a very obsessed individual, who knew her in passing but wasn’t a friend, had motive due to Kaylee leaving, and would explain the why most were killed in bed, with one with defensive wounds. And if most were killed in bed, it would significantly reduce the blood trail as he left through the sliding door.