In my opinion, the perp was hiding up on the hill behind the house in that wooded area waiting for everyone to go to sleep after they all had returned home from their nights out. He waited until the lights were all turned off and figured that everyone was asleep (most likely around 3:30 am or so). The whole time he is waiting in the wooded area he is seething and his adrenaline is building up in anticipation of killing K or M or maybe both.
He makes his move and enters through the sliding patio door that goes to the kitchen that has been left unlocked or wasn’t locked securely enough. He knows that both K and M have bedrooms on the 3rd floor and quietly walks through the kitchen over to the stairway and goes up to the 3rd floor. He selects one of the bedrooms and enters quietly and stabs K or M to death. No screams are heard because they were sound asleep.
He then proceeds to the next bedroom on the 3rd floor and enters the room and stabs the other girl to death who was also sound asleep. If he was targeting just one of the girls he may have selected the wrong room initially so he went to the other room to kill his intended target. LE knows the intended target due to severe and excessive stab wounds to her body.
The killer heads back downstairs to leave the house but he encounters E who may have heard something and woke up to check on things. He gets into a fight with E and starts stabbing him until he kills him probably in the living room area (E more than likely has defensive wounds). X wakes up when she hears the commotion and probably yells out to E. The perp hears her and goes into her bedroom and kills her (she also has defensive wounds).
The killer exits the house through the sliding patio door and makes his way through wooded area and walks back to his house or apartment in the dark. This whole incident could have happened fairly quickly maybe 10-15 minutes max. The next puzzle to solve is who did this and what his motive was. In my opinion, these crimes were committed by 1 person who was in a rage and determined to kill one of both of the girls that may have humiliated him. I’ll state who I think may have done this in another

