Ralph Sarchie is a retired NYPD Sergeant and Catholic demonologist. He has written a book, Beware the Night, which details many of his paranormal investigations; his accounts were later the basis of the film Deliver Us from Evil. Sarchie, in 2016, was featured in the film Hostage to the Devil, which detailed the life of Malachi Martin.
Sarchie served eighteen years as a NYPD sergeant in the South Bronx precinct. Although he was raised in a Roman Catholic Christian family, Sarchie's faith waned "but it's now fully restored." As such, Sarchie describes himself as a "committed Christian"; he possesses a relic of the True Cross. Ralph Sarchie, along with his partner Mark Stabinski, carry with them wooden Christian crosses and holy water when called to tackle "demonic infestation around the city." He assists in Christian exorcisms. His career as a Catholic Christian demonologist has included regularly meeting with and accompanying Ed and Lorraine Warren on their cases. Sarchie states that demonic possession can be identified by signs "including unnatural strength, speaking in different languages, having knowledge of events that one would have no way of knowing, a woman speaking in a man’s voice and a person making animal sounds." He states that he prays everyday and among these prayers are the Dominican rosary. When interviewed with TheBlaze, he stated that he has "never accepted a penny for his assistance" and has to fund travelling expenses himself when he takes on cases.
In 2001, St. Martin's Press published Sarchie's book, Beware the Night (also titled Deliver Us from Evil), co-written by Lisa Collier Cool, about his experience as a NYPD cop and demonologist.