Thanks to crime scene analyst Chris Kauffman, CLPE, retired lieutenant of the Bettendorf (Iowa) Police Department, who has been so much help to the authors in the past. Thanks also to computer forensics investigator Paul Van Steenhuyse, retired lieutenant, Scott County (Iowa) Sheriff’s Office.

Insights were also provided by profiler Steven R. Conlon, retired Assistant Director, Division of Criminal Investigation for the State of Iowa Department of Public Safety; and Matthew T. Schwarz, CLPE, Identification Bureau manager, Davenport (Iowa) Police Department. For behind-the-scenes TV production matters, we were helped by our longtime film and video collaborator, Phillip W. Dingeldein.

Among books consulted were: Practical Homicide Investigation (1996), Vernon J. Geberth; The Encyclopedia of Serial Killers (2000), Michael Newton; Mind-hunter (1995), John Douglas and Mark Olshaker; In the Minds of Murderers (2007), Paul Roland; and Profile of a Criminal Mind (2003), Brian Innes.

Special thanks are due the following: our editor, Michaela Hamilton, who was enthusiastic from the start and supportive throughout; agent Dominick Abel, for his friendship and professionalism; and our wives, Barb and Pam, in-house editors and support systems.