Zodiac killer | Name, Never Caught, Letters, Suspects, & Facts  Encyclopedia Britannica Mon, 27th July 2026

Oxygen’s Love, Ted Bundy Reveals Letters Notorious Serial Killer Wrote From Death Row  Oxygen Official Site Fri, 16th January 2026

Crime and thrillers of the month – review  The Guardian Tue, 9th July 2024

Letters from a Killer (1998)  IMDb Mon, 27th October 2025

Author Interview: Joshua Chaplinsky On LETTERS TO THE PURPLE SATIN KILLER  Fangoria Wed, 17th July 2024

Lucy Worsley Investigates | Jack the Ripper: A letter from the killer? | Season 2 | Episode 1  PBS Tue, 7th January 2025