I will say it all one more time. Eva, Hideyoshi, Rosa, Rudolf, Krauss, Natsuhi, Gohda, Kumasawa, Genji, Kyrie, Jessica, George, Battler and Maria are all dead. That makes 14 bodies. There is no 15th person on this island. In other words, every human that was here on October the 4th is now dead.
From the first twilight (the dining hall murders) all the way through to Maria’s death, there are no suicides. There are no poisons used, and there are no hidden exits. There are no mutual murders, and no traps employed to kill. Every murder was done with the murderer in the room.