...There is also the unsolved case of two US contractors who warned last fall of massive fraud in the ministry of defense. One wrote to Senator Rick Santorum about it, who in turn went to US SecDef Donald Rumsfeld. The contractors were driving near Taji when their car was rammed and then they were shot multiple times. Their personal effects were photographed and put up at a radical Salafi website. But then anyone can post to a website....Link
These mercenaries are not the only people posing credible threats to the Cheney administration that have prematurely ended up dead. You can find a partial list at Bush Body Count.