I hard all things in heaven and in the earth, I heard many things in hell.
Claim: The killer is mentally insane
I think it was his eye! yes, it was this! He had the eye of a vulture--a pale blue eye, with a film over it. Whenever it fell upon me, My blood ran cold; and so by degrees.
This is very creepy, because hearing things in hell and I do not even think that is posible. This also makes me think that he is hearing voices in his head that is telling hm what to do.
I think that he thinks that he needs to kill him because of the eye. the only way to stop the evil eye is to kill the old man. Something compelled him to do it like him hearing voices the eye haunting him.