An American, she was born in 1959 and was orphaned at the age of four where on she was left at the steps of a convent, the Our Lady of the Virgin Mary.
Though a rookie, Sister Shannon training was completed and she was sent home to New York City where she patrolled two sectors from her assigned Manhattan parish on the grounds that she was assigned to an area where there had not been demonic activity since the Purge of 1985.