Investigation, in All its Glory

Mattias was walking down an undisclosed hallway at an undisclosed location. He walked up to a door, in which he typed in a 17 number code to open the door. He walked inside, took off his coat and hung it up, and sat down next to his computer. He started watching the most recent footage of the Kira killings. While watching the news, he thought to himself, "Five listed criminals were in the same general area. Two which were killed after sending some sort of message, three which died of regular heart attacks." He scratched the back of his head, "Well this could mean a multitude of things. He wanted this to happen, to confuse detectives. Unless, he slipped, and instead of them actually following out any instructions, they defaulted. That would explain why most of the killings were heart attacks, anyway. That poem sounds like something a murderer would write, and Demegawa announced something about a demonstration. That would make sense, but it would also lead that he isn't very experienced with the way he kills, meaning he would have had to retrieved it from something, or someone. But THAT would have to mean a bio-weapon that can destroy human life via heart attacks and leave no trace actually exists in this planet. Of course this is all a theory, and none of it makes any sense...but..." Mattias fell asleep at his computer screen, after researching for a solid half hour.