He cannot stand the old manś eye because it looks like a blue vulture eye.
He sneaks into the old manś room every night trying to kill him.
One night he actually killed him by pulling the mattress off the bed and smothering him.
After his heart stopped beating, he buried him under the floorboards so no one could see the body anymore.
The police came and asked him what happened to the old man. he told them that he didn´t, but after he said that he suddenly heard his heart beating. He tried to ignore it, but it kept getting louder. He told the police that he really did kill the man.