The old man doesn't know it, but he is being watched and is about to be murdered
The murder smothers the old man and cuts off his arms and chest, legs, and head
After the murder cuts up the body parts, he hides them under the floorboard so that nobody knows where the body is
The two police officers are walking to the door of the house to search it because they got reports of a loud noise
The murderer lets the officers search the house and lets them sit down right over the body, but they don't know it. The murderer starts to here a ringing noise and begins to pace. Then, he admits to killing the old man.
The police officer find the body under the floor along with the murder weapon. The murderer then went to trial and was sentenced life in jail.