OR he did not intend to kill anyone and did not premediate or plan murder, of course.
Pretty sure that after he saw the effects of stabbing a knife into one person that, at that point, he knew he was killing someone with a knife, and yet he moved right along to the next person.
That's premeditation. What else would it be? Even if he was somehow overtaken by passion and jealousy at the sight of his unintended victim, he went on to three more. His feet moved him around the house, instructed by his brain.
IMO, K was in her own room at the beginning of this, fled to M's room, where he killed both of them. He knew what a knife can do and he had one in his hand,
he unsheathed it, no one else unsheathed. When you have a big personal defense/offense knife and you unsheath it, you know you have a big weapon in your hand.
He then thrust the weapon into the first victim and now had first hand knowledge of what the knife could do. He continued to use the knife.
That's premeditation, under the law, IMO. Even if he had some squirrelly argument about one of the victims "making him do it" or "causing extreme passion such that he could not control himself."
Oh, and of course, he entered the house in the middle of the night, knowing it was not his house and that he had no legal right to be there. With a knife. Which he unsheathed. After driving around the house 4 times and even having to do a 3 point turn to get himself in position to park where he wanted to park.
And he turned off his phone beforehand.