And now, the RECORDS OF TRUTH of this lower plane will be laid bare for all to see.
The killer is the detective that was “the first to walk in through the door after their deaths”.
He transported their unconscious bodies to the scene in the back of his van, and then in a trolley.
The trolley wouldn’t fit through the doorway, but he knew of a secret passage that it would fit through.
He only killed the two Africans, he did not kill the Asian, they had not entered the room yet.
While he was manipulating the crime scene to give the appearance of a suicide, he stumbled upon a second secret passage that sent him out of the room.
The detective was terrified, he found the floor plans to this building, and he found no such evidence of this secret passage. He fled the building immediately, fearing that the ghosts of those that passed were trying to take their revenge.
The Asian man by sheer coincidence, wanted to kill himself that day thanks to his recently inflicted blindness.
He had played in the building as a child, and with sufficient feeling around with his cane managed to reach the room. For old times sake he used the first of the secret passages to enter the room.
He walked into the room with a gun and shot himself in the head.
The detective later “discovered” the scene of the crime after hearing a fictional anonymous report of it. Part of his reason for returning was to continue manipulating the scene after he calmed down. He rushed to the scene, but was then genuinely surprised to see a third dead body.
Farewell voyagers, may we meet again, to chortle at yet another mystery.