The Narrator in The Tell-Tale Heart

How would you characterize the Narrator in Poe's short story? Give specific example to justify your claim.

The narrator of the Tell-Tale Heart is an unnamed person who tries to convince us the reader that he is completely sane. From the beginning of the short story written by Edgar Allan Poe we get a sense of feeling that the narrator isn’t well. “TRUE! --nervous --very, very dreadfully nervous I had been and am; but why will you say that I am mad?”. The narrator of this story has committed a crime. He has murder and innocent old man just because of his eye. The narrator felt that the old man’s eye was always following him around. “The old man's hour had come! With a loud yell, I threw open the lantern and leaped into the room. He shrieked once --once only. In an instant I dragged him to the floor, and pulled the heavy bed over him. I then smiled gaily, to find the deed so far done. First of all I dismembered the corpse. I cut off the head and the arms and the legs.” The narrator's guilt gets the best of him and he starts to have hallucination that the old man's heart is still beating under the floorboards. Driving him into confessing his crime to the policeman who had passed by his house. Thereby getting caught.