I saw it in the 80’s, and can’t remember much about it, except for this:
After killing the protagonist inside their home, the antagonist heads to the bathroom and takes a bath.
Only the protagonist is not really dead! We seem them pushing a toaster from the kitchen, into the living room, and down the hall, finally into the bathtub, killing the murderer, and serving justice through the world’s longest appliance cord.
Any help? My google-fu can’t find anything.