After the BTK killer Dennis Rader was arrested on February 25, 2005,
police uncovered his stashes of writings, photos, artwork and other
assorted items he had kept over the years related to his crimes. He
had a bondage fetish and enjoyed wearing the undergarments of his
slain female victims.
His obsession for bondage expressed itself in his artwork. He used
tracing paper to reproduce female images from photographs, and then
would add ropes and other bindings. Rader was obsessed with cutting
out magazine and newspaper ads of women models and sketching binding
materials over the images.