In the story it shows that the guy has a metal illness and he is in a hospital. He is telling the nurses of what he did to the old man.
The guy in the story is thinking of killing the old guy because he thinks that the old guy's eye was evil, and also thinks that his eye is a vulture.
He has seen the old man sleep about every midnight for a week. He has opened the old man's door really quietly. To see if the old man had his eye opened. But never saw it opened.
But in the eighth night it tells us the old guy moved his hand, and the guy kept trying to open the door slowly then then the old guy stood up from his bed because the guy chuckled. After it tells us that the old guy said something, and the guy waited a few minutes after he thought he heard the old man's heart, and thought it could be heard, and suffocate the old guy with his bed.
In the story it says that after he suffocated the old guy he took him to the bathroom and took out the corpse, and dismembered them. After he took up three planks from the floor and put the old man in there. When he finished he heard a knock on the door, and there were two police officers and the guy invited them in and talked in the old guys room.
After it tells us that he admitted that he killed the old guy. He told the police officers he did it because he thought he was hearing the old man's heart even after he killed him.