and ford >> stahl: it's a mysterious death that has made world headlines. the victim was found with a bullet in his head. he was an argentine prosecutor with ten bodyguards and a long list of enemies, including the country's president and foreign minister. one of the great mysteries is whether mr. nisman killed himself or whether he was murdered. so, what do you think? >> that i am... i am part of that mystery. i don't know. >> lance corporal jonathan f. straud. lance corporal gregory a. posey... >> pelley: this was september 2009. we were there as golf company stood rigid in a mud-walled memorial ser