1968 - Sirhan Sirhan murders Robert Kennedy, at a hotel in Lost Angeles.
1972 - muslims murder Jewish athletes, participating in the Munich Olympics.
The Munich Olympics were different. That was a planned attack carried out by a prepared group. That's also why the bombings of French and German clubs in the 1970s were omitted, as well as the mass murders in New York, London, Madrid, Czechnaya, Moscow and Bali.
Pratt's list is individuals who killed without support and preparation from an organization.