PATHOLOGY

Detailed explanation-1: -He believed that a “vulture or evil eye” has the power to harm him with a mere look, so he killed the old man so that his “evil eye” would trouble him no more.

Detailed explanation-2: -One night, though, the old man awakens as the narrator watches, revealing the eye. The narrator strikes, smothering the old man with his own mattress. The narrator chops up the body, and hides the pieces under the floorboards. The narrator then cleans the place up to hide all signs of the crime.

Detailed explanation-3: -The reason he said he hated the old mans eye was because it was like his eye could see through his soul. He even said in the story he loved the old man and that he never did anything wrong to him. But sadly that since the eye creped him out so much he wanted him gone or at least just his eye gone.