Book excerpt: A professional behavioral witness to more than a hundred capital trials explores the making of a murderer. CSI shows us where a crime is committed. Forensic detectives show us how. But what really goes on in the mind of killer? What is it in each potential victim that sparks in them the urge to take a life? What are the reasons behind a quick thrill kill, or slow torture? Between choosing someone they know, or a stranger? As they stand before a jury, after reams of graphic evidence, the question is no longer whether or not they committed the unthinkable. The question posed to Wanda Draper, expert in behavioral science and child development, and key witness in more than a hundred high-profile trials, is why? The answer is all that stands between a sentence of life in prison or death row. In this unique true-crime investigation, Draper shares some of the darkest cases of her career. She sheds light on the personal circumstances and critical life events that perverted childhoods and brought convicted murderers to trial. She reveals how the past casts a grave shadow over one’s future. And in doing so, explores one irrefutable fact: killers aren’t born, they’re made.