US hide truth about killings of journalists in Murica. If you read reports of CIA-pet "Reporters without borders" you can't find info about killings of journalists in US.
http://en.rsf.org/press-freedom-barometer-journalists-killed.html
Do you think this is because Murica is land of freedom and democracy? Nope, it's because this theme is taboo. For example you don't find info about killing of David Christopher Bird in these reports.
http://www.wsj.com/articles/body-of-missing-reporter-found-in-new-jersey-1426789646David Christopher Bird,
But it's not single case
http://en.wikipedia.org/wiki/Chauncey_Bailey
http://en.wikipedia.org/wiki/Bill_Biggart
http://en.wikipedia.org/wiki/James_Edwin_Richards
http://en.wikipedia.org/wiki/Manuel_de_Dios_Unanue
http://en.wikipedia.org/wiki/Fritz_D'Or