Conversation so far:
what were the killian documents?
The Killian documents controversy involved six documents that are critical of President George W. Bush's service in the Texas Air National Guard in 1972–73
why were the killian documents important?
Rather presented Killian documents as authentic in a 60 Minutes II broadcast aired by CBS on September 8, 2004, less than two months before the 2004 presidential election
what info did the killian documents contain?
Burkett claimed that Bush's commander Lieutenant Colonel Jerry B. Killian wrote them, which included criticisms of Bush's service in the Guard during the 1970s.
who claimed that the killian documents were forgeries?
The Panel report stated, The Panel met with Peter Tytell, and found his analysis sound in terms of why he thought the documents were not authentic
was it ever proven that the killian documents WERE forgeries?
On Larry King Live, Rather was interviewed commenting Nobody has proved that they were fraudulent, much less a forgery. ... The truth of this story stands up to this day.

Question: who conducted the investigation?
Self-contained rewrite: who conducted the investigation into the authenticity of the killian documents?