Chilling never-before-scene sketches by the BTK serial killer have shown girls gagged with nooses around their neck.Cops released the images as they step up the investigation into a slew of unsolved murders which they suspect Dennis Rader may have been involved in.Rader, known as the BTK killer, 'Bind, Torture, Kill' went on a murderous two decade killing spree during 1970s to the 1990s, including two children in . He pleaded guilty to ten murders and is currently serving ten consecutive life sentences.
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