In the old man's room on the eighth night at midnight
During his interrogation, the narrator tells us about the "disease" that he supposedly had, and the fact that he could hear things that we couldn't. Then he goes on talking about the man that he killed, whom ironically, was the person he took care of.
The deed is done, the eye is gone
Knock Knock [At the door]
The narrator decided to take the life of the old man, of which he took care of, and thus rid himself of the old man's "Evil Eye" forever.
Villains! I admit the deed! --Tear up the planks! here, here! --It is the beating of his hideous heart!
Our narrator proceeds with caution continuously for 7 nights, just at midnight, in order to kill the old man when he saw the eye, but never seemed to find it open. He makes a noise one night and the old man doesn't manage to go back to bed due to fright which made the narrator stay completely still for one hour.
THE OLD MAN WAS UNDER THERE THE WHOLE ENTIRE TIME!!!
On the eighth night the narrator found the perfect time to kill the old man since the eye was open, he couldn't control his anger, and leaped into the room, pulled over the bed and suffocated the old man till he was dead.
When the narrator suffocated the old man
In order to hide the evidence, the narrator cut up the pieces of the old man's body and hid his body under the floor boards, just in time before police officers came into the home for complaints of screaming in the night, and the narrator seemed to be completely normal, without a trace of fright.
No one will ever find out
The narrator hiding the old man's body under the floor boards
The beating of the dead old man's heart started and curiously the narrator was the only person who could hear it, which drove him crazy since the beating got louder and louder, until he admitted to the police officers about the crime that he had committed.