21st-century America is a technological wonder: cell phones, internet, 24 hour news media, DNA breakthroughs, people on the move, amd expanding urban centers. But many of the old problems remain: drug addiction, homelessness, prostitution, poverty, gangs, murder, and serial killing. Starting in the 1990s serial killing in America has transitioned and adapted to the changing world, while at the same time in many ways staying the same. What has changed: There is new forensic technology particularly DNA analysis, better cooperation between law-enforcement jurisdictions, increasing awareness and fascination in the media and on the Internet with the serial killer. Most importantly there are new psychological understandings of the serial killer.