Sergio

Sergio is a 2009 documentary film based on Samantha Power's biography, Sergio: One Man's Fight to Save the World. The film revolves around the story of a Brazilian United Nations diplomat, Sérgio Vieira de Mello who worked for the UN for more than 34 years and was ultimately killed in the Canal Hotel bombing in Iraq on August 19, 2003. The work includes extensive interviews with William von Zehle, a U.S. Army First Sergeant in 2003, who spent hours trying to rescue de Mello from under a 9m stack of concrete and other debris of the collapsed building.

Synopsis from Wikipedia, CC BY-SA 4.0. Everything below written here.