Gary Ridgway.  America's most prolific serial killer.  He claimed he murdered prostitutes because he thought he could get away with the crimes -- and for nearly two decades, Gary Ridgway, the Green River Killer, did. Ridgway murdered at least 49 people in and around Washington state's King County.

Gary Ridgway. America's most prolific serial killer. He claimed he murdered prostitutes because he thought he could get away with the crimes -- and for nearly two decades, Gary Ridgway, the Green River Killer, did. Ridgway murdered at least 49 people in and around Washington state's King County.

Jack Olsen, true crime author.

Jack Olsen, true crime author.

Robert K. Ressler is a former FBI agent and author. He played a significant role in the psychological profiling of violent offenders in the 1970s and is often credited with coining the English term "serial killer".

Robert K. Ressler is a former FBI agent and author. He played a significant role in the psychological profiling of violent offenders in the 1970s and is often credited with coining the English term "serial killer".

Jeffrey Lionel Dahmer was an American serial killer and sex offender. Dahmer murdered 17 men and boys between 1978 and 1991.

Jeffrey Lionel Dahmer was an American serial killer and sex offender. Dahmer murdered 17 men and boys between 1978 and 1991.

M. William Phelps, true crime author.

M. William Phelps, true crime author.

Dennis Lynn Rader is an American serial killer and one time mass murderer who murdered ten people in Sedgwick County, between 1974 and 1991. He was known as the BTK killer. "BTK" stands for "Bind, Torture, Kill", which was his infamous signature.

Dennis Lynn Rader is an American serial killer and one time mass murderer who murdered ten people in Sedgwick County, between 1974 and 1991. He was known as the BTK killer. "BTK" stands for "Bind, Torture, Kill", which was his infamous signature.

Angelo Buono Jr. and Kenneth "Kenny" Alessio Bianchi, collectively known as "The Hillside Strangler(s)", were a pair of serial killers responsible for the murders of at least 12 women.

Angelo Buono Jr. and Kenneth "Kenny" Alessio Bianchi, collectively known as "The Hillside Strangler(s)", were a pair of serial killers responsible for the murders of at least 12 women.

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