Mary Catherine

Mary Catherine was a nun at the St. Bonaventure Convent in Milton, Illinois.

Background
In 1958, Knight of Hell Abaddon arrived at the convent and took possession of the Mother Superior. With the help of her demons, Abaddon began extracting souls from the nuns at the convent, Mary becoming one of the first victims.

In her soulless state, Mary killed two other nuns and then committed suicide. The strange deaths alerted the Men of Letters to the convent, and they promptly sent Henry Winchester and Josie Sands to investigate.

Appearances

 * Season 9
 * Mother's Little Helper (mentioned only)