Robert D. Keppel is the chief criminal investigator for the Washington State Attorney General's Office. He has a Ph.D in criminal justice from the University of Washington and has been an investigator or consultant to more than two thousand murder cases and more than fifty serial murder investigations, including the Atlanta child murders and the Green River murders. With William J. Birnes, he is coauthor of "The Riverman: Ted Bundy" and I" Hunt for the Green River Killer, " published by Pocket Books.