Until Death was based on an older script by Dardano Sacchetti. Director Lucio Fulci claimed to have created the original story for the film with a title Evil Comes Back based on the 1934 novel The Postman Always Rings Twice. Fulci claimed that Sacchetti then wrote it up and submitted it to several producers with Fulci's name attached, and then found it sold to Luciano Martino with only Sacchetti's name attached. Fulci stated he decided not to sue Sacchetti but broke off all relations with the screenwriter. Sacchetti claims that he was working on a script trying about sex and ghosts but couldn't choose which one to focus on and that Fulci asked him what he was working on which was a pseudo-sequel to The Postman Always Rings Twice. Sacchetti claimed that Fulci had taken it from producer to producer without it going into production and went as far as having it translated into English without Sacchetti's knowledge. While working on Brivido giallo, Sacchetti stated that Bava knew about the script and asked if it was still available for the series as they required one more episode.
