ジル・ド・レ
The story of the film came from producer Ermanno Donati who is credited under the pen name Phil Young. The film's credits state the plot is based on famed serial killer Gilles de Rais but this is fictional. The film was originally titled "Il freddo bascio della morte" (), a title that appeared on the French release prints only. It went into production in June 1965. The film was shot at the Villa Parisi.