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2. Lewis May Be Hinting At Maureen's Impending Death

If the spirit is indeed Lewis, though, it's been suggested that he may be hinting at Maureen's own impending demise, and that it is her and Lewis' heart condition which made them able to see ghosts in the first place, as death lingers close to them at all times.

Early on, Maureen states that Lewis was very "full on" with his activities as a medium before his death, so the growing intensity of his work with spirits may well have foreshadowed his demise, and with Maureen now experiencing a great deal of paranormal phenomena herself, she may be next, ironically beckoned into the afterlife by her brother.