Edgar check on the old man every night at midnight waiting for his eye to open to kill him. But he is waiting for the eye to open to kill him because he hates his eye not him, the old man didn't every to anything to Edgar and Edgar likes him too.
While checking on the old man Edgar accidentally made a loud noise waking the old man and the old man yells "who's there"!
Ow my ears, what is that loud noise?
After the old man opens his eye in the middle of the night Edgar pulls the old man off the bed and suffocates him with mattress.
Did I ever tell you how amazing you are?
After Edgar kills the old man he cuts apart his body and hides him in the floor boards. A little later police come knocking on his door asking why the neighbors heard a scream in the middle of the night.
While talking to the officers Edgar hears a ringing in his hears, shortly after the noise gets louder and louder, then he realizes that the noise is not in his ears, it's coming from the man.
When Edgar is talking to the old man in way to try to make the old man feel comfortable so when and if he wakes up in the middle of the night he is not scared that Edgar is going to do something.