Serial killer Gary Leon Ridgway, known as the Green River Killer, murdered at least 49 women in Washington state before he was caught in 2001. This book gives students an in-depth account of the Green River killer investigation, and explains how law enforcement agencies worked together to gather the evidence needed to apprehend and convict Ridgway. Sidebars offer step-by-step explanations of the scientific and legal processes involved in the investigation.