During 80s bodies of women were found along Green River in US. The murder pattern showed that killer in all cases was same. Task of catching killer was given to detective Robert Keppel. Robert has worked with forensic psychologist Richard Walter and wrote article on classification of serial killers.
Robert decided to interview a serial killer called Ted Bundy. Insights from Ted Bundy helped him to create profile of Green River killer.
In 2001 a spray painter Gary Ridgway was arrested for Green River murders. Gary Ridgway was earlier arrested in 1982 as a suspect in Green River murders, but due to limitations of DNA profiling during that time he could not be linked to killings (he managed to clear polygraph test!). By 2001 there were lot of advances in DNA profiling. Earlier samples were now subjected to DNA profiling and it was found it Gary Ridgway was Green River killer.
Gary Ridgway was spared of death sentence for helping police in locating places where he had buried his victims.