Until yesterday (click here) there were six journalists killed in the USA between the years 1992 to 2015. The motives behind the deaths were investigated and decided. The deaths were related to the journalists work. Yesterday set a new standard for journalists working in the USA. Revenge is a new definition.

Of the six journalists killed there is one with an unconfirmed motive.

James Edwin Richards, Neighborhood News 
October 18, 2000, in California, USA