It’s the world’s worst spree killing. Discovery Channel Norway Massacre: The Killer’s Mind examines the terrible events of that day. In 90 minutes of madness, 32-year-old Anders Behring Breivik killed 69 young people. The killer’s action are analyzed by a host of experts, including: renowned criminologist Professor David Wilson; Katherine Newman from Princeton university who is one of world’s the top experts on spree shootings; Matthew Goodman, the leading authority on British and European right wing terror groups; and terror and weapons expert Charles Shoebridge. And foremost, above all, is the memory of those who died.