Congressional investigators could not determine when senior Pentagon and White House officials learned the details of the "friendly fire" death of Pat Tillman, the Army Ranger and former NFL player, and what role they may have played in the misleading release of information about the 2004 Afghanistan firefight that killed him, according to a preliminary report released yesterday. The House Oversight and Government Reform Committee has been examining the aftermath of Tillman's death to determine why the military and the White House did not inform his family and the public about the nature of it. Investigators found that senior officials could not remember how they learned the truth or what they did in response to learning it.