The original content of Democracy Now! Headlines appears under the Creative Commons BY-NC-ND 3.0 License (United States). For more, including their other shows and media, visit www.democracynow.org. April 6, 2012 U.N. Commissioner Calls for Probe of Trayvon Martin Killing ------------------------------------------------------------ The United Nations High Commissioner for Human Rights, Navi Pillay, has called for an immediate investigation into the circumstances surrounding the killing of 17-year-old Trayvon Martin. Pillay said she was shocked the gunman, George Zimmerman, was not arrested. She also expressed concern about Florida's "Stand Your Ground" law, which allows the use of deadly force in situations where there is a belief of a threat. .