A forensic psychologist - Dr Katherine Ramsland explained on a podcast how the BTK killer (Dennis Lynn Radar) was finally caught.
Ramsland has pointed out on the podcast 'Coptales and Cocktails' how Radar's criminal evolution began at a young age. Typical of serial killers, a lack of empathy began with cruelty to animals with Radar hanging cats. Along with this troubling development was a rich fantasy life in which Radar would imagine binding girls to railroad tracks.
Later in his criminal development, Radar devoured true crime magazines and cultivated a fascination with famous serial killers.
For her part, Ramsland points out the origins of her fascination with her work being Jack the Ripper and the enduring puzzle it has left.