The house groundskeeper who surprises the girls and falls down the stairs, resulting in paralysis from the neck down. He survives their initial cover-up attempt, accidentally reveals his presence, and is ultimately smothered to death by Cali, becoming the central figure in the fabricated crime.
Cali deliberately kills Arthur to eliminate the threat he poses to the cover-up.
Cali smothers Arthur with a pillow after deciding that he will not die from his paralysis soon enough.
Arthur becomes the alleged attacker in Holly's false self-defense story, although the plot states that the story is fabricated.
The girls fabricate a story claiming that Arthur entered the house and attacked Holly before falling down the stairs.
Arthur's presence places Mel inside the escalating criminal situation.
Arthur's arrival causes the girls, including Mel, to panic and create a false account of the incident.
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