Not Friendly Fire
This story has been around awhile, and the allegations aren't new. But there are aspects to this that strongly suggest deliberate murder.
Pat Tillman : Executed by His Own Government?
"Circumstantial evidence, primarily illogical actions at very high levels of the administration, suggests more than a cover up of a “friendly fire” accident (a common mistake during war.)
Had Tillman been accidentally shot by one of his own unit the whole matter could have been put to rest by holding a few harsh court marshals of those immediately involved, and issuing profuse apologies to everyone. But, America’s most famous volunteer soldier was, according to his brother and constant companion, on the verge of whistle-blowing the bankruptcy of US policy in Iraq.
The untimely death of Tillman could not have been timelier for the top civilians in charge of making war, but covering for an assassination is not so simple."