Guiley died on Thursday, July 18, 2019, after a battle with colon cancer.
[8][9] Her works include Atlas of the Mysterious in North America (1995) – a listing of places in Canada and the US associated with mysterious occurrences;[10] The Encyclopedia of Witches and Witchcraft;[10] Harper's Encyclopedia of Mystical & Paranormal Experience – a reference book on topics related to spirituality, mythology and New Age;[11] and The Encyclopedia of Angels.
[12] In 2011, Guiley published Talking to the Dead via Tor Books, co-authored with George Noory.
She was working with Darren Evans on the book The Zozo Phenomenon which was published by Visionary Living, Inc.[13] Guiley was a consulting editor of Fate magazine and a regular guest on Coast to Coast AM.
[18] Christian evangelist John Ankerberg criticized Guiley's understanding of intuition (as she described it in Harper's Encyclopedia of Mystical and Paranormal Experience – "intuition invariably proves to be right"), saying that with beliefs like those, rational thinking and spiritual discernment are often discarded.