Watseka Wonder

According to Stevens, Vennum's character would change suddenly, from morose and sullen, to "mystic and imaginary trances" in which she described joyous trips to heaven and visits with angels.

Bruce wrote that recurrences of the "Mary personality" appeared "only when the Roffs paid her visits, and that they ceased entirely upon her marriage to a man not interested in spiritism and her removal to a distant part of the country.

"[1] An obscure syndicated radio program, Out of the Night, dramatized the case as "The Girl With the Dual Personality" sometime around 1949,[6] a recording of which survives.

DC Comics' horror anthology, House of Mystery (#5, August 1952), had a half-page filler titled, "Double Mourning!"

It is the titular story in her collection Spirit Seizures which won the Flannery O'Connor Award for Short Fiction and was published by University of Georgia Press in 1987.

In the 2021 Travel Channel series, Ghost Brothers, Mary Roff's former house is investigated for her lingering spirit.