"Whether your piece died instantly or you passed at, you weren't in a position to know anything more than you did."
"I have a question," Bernkastel raises her hand. "The culprit. Are you really going to try and make us believe that it's some mysterious extra person?"
"Is that important?" I look at the ceiling above me. "Very well. The culprit is someone that Amy and Ozaki saw in the course of the game. In other words, the culprit is either Krauss, Natsuhi, Jessica, Dr. Nanjo, Gohda, Kumasawa, Genji, Eva, Hideyoshi, George, Battler, Rudolf, Kyrie, Maria, Rosa, Ozaki, or Amy. Nobody apart from those 17 people on the island are the culprit. There is only one culprit."
Theories presented in the game each had their flaws. Kumasawa did not lock the door to Krauss's study, nor was her key taken from her. Genji did not give up his key, either.
In the gold room, you found Maria's corpse. You saw a red proclaimed that the person who killed Maria did not exit up the stairs. I'll also say that that person did not escape through the trap door immediately after killing Maria.
That's all I have to say."