Well, the Pinochet government's own internal documentation found that it was an assassination.
http://archive.boston.com/news/science/articles/2011/05/31/c...
Nope. It says that he was shot with AK into the head after his death. It doesn't look like assassination.
> citing a reference in the initial military autopsy to a small bullet hole in the back of Allende's skull that he alleges is inconsistent with an AK-47 fired from below the chin through the top of his head.
people unfamiliar with the story might find it interesting that the exact manner of his death is somewhat disputed. obviously he wouldn't have died then if it weren't for the coup, so it's not like what you wrote is really a stretch.
https://en.wikipedia.org/wiki/Death_of_Salvador_Allende