Agree that perp may have been in the house already and let the dog out, hid on third floor if M or K was intended target, and calls were to dog’s co-owner worried about dog’s whereabouts. Do not agree with the idea of someone else who posted in this chain that perp made calls on M/K phones because would not know their passwords to open their phones. Possible scenario: M&K got home, ate the food from grub truck on second floor kitchen/common area, then went upstairs to room where dog was supposed to be, dog not there, worried calls until 2:52, possibly also asked X&E if they had any idea about dog’s whereabouts, house settles down after M/K conclude dog will come home on its own or is with co-owner even though not planned in advance, both sleeping in M’s bed since K already moved out, then perp emerges from 3rd floor hiding place and attacks them, comes downstairs to leave and encounters E&X and kills them also though that was not part of the original plan, exits thru sliding door off kitchen. All obviously speculation and MOO. My sincere sympathies to the families and friends.