***** SPOILERS *****
The whole fat killer is NOT a split personnality thing from my point of view. At the beginning of the movie, Marie is in the psychic hospital, and she is asked to retell what happened. Marie takes on the role of the narrator of the story, so this is why we see the killer do things when she is not there.
She did everything, the killer is just someone she made up to justify the fact that it was not her. He can be seen perhaps as the embodiement of her murderous urges in her story, but I don't seem him as a split personnality per se. Call it distancing if you will: "No, I couldn't have done such things, a killer came into the house, I pursued him, we fought..."
These things happen very often, how many times do we hear about a murder case where a mysterious killer entered a house just to find out later that such a man never existed, and that the husband/wife/father/mother, etc. did it?
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