the narrator explains he is not mad (insane) , but just nervous & diseased , but can tell us the story calmy.
the narrator wants to kill the old man because of his vulture like eye .
the narrarator stalked the old man every night for 7 nights , with no reason to kill him because he could not see the eye.
on the 8th night the narrarator kills the old man after a hour standoff ,the narrarator finally sees the old mans eye and charges and suffocates the old man.
after the narrator kills the old man he chops up his remainsin the bathtub , so there is no blood and stores remains under floorboards . The cops knock at old mans door and narrator invites them in to search.