Keith Hunter Jesperson aka The Happy Face Killer. Letter from author Jack Olsen who wrote the non-fiction true crime book titled 'I' about the case of serial killer Keith Hunter Jesperson. This letter to Jesperson was written the year before Olsen passed away on July 16, 2002.

Original one page typed letter dated January 6, 2002 from author Jack. Olsen to Keith Jesperson.
The letter is hand signed, Jack.