Gunshot to the back of the head is a meme making fun the bizarre circumstances of some of the "suicides" of high profile whistle-blowers.
AFAIK, the only instance of a multiple gun-shot to the head suicide that I can think of was Gary Webb who was writing about the CIA's role in the distribution of crack in America in 2004. He wasn't really leaking new info that wasn't already known though.
I could swear that among the many suicides of Bush-era whistle-blowers in the mid 2000's, there was one particular instance of a suicide via a shotgun to the back of the head in a remote area, but I could be completely wrong.
My position on this is it's a common affair in many governments throughout the world (maybe most?), I genuinely do not believe that the real owners of any country are above using it as a tool for suppression of information. I also don't think they would have any problems being so brazen about it either.
A lot of inconsistencies in the public version of events for these situations can be attributed to bumbling stupidity of the people involved. Idiot coroners, shitty police work, conflicting versions of events by eye witnesses etc.
