This just reminded me of "Mother Night" a book by Kurt Vonnegut. Long story short, the protagonist is a patriotic American that during the war was approached by somebody working for the American government and is asked to go undercover and become a traitor and work for the Nazis instead. They needed somebody on the inside to deliver coded messages to the Allies and he was chosen. The book is all about who we present ourselves to be and do we eventually become that which we pretend we are?
During all this, he's in a cell in The Hague and he's writing out his memoirs of which we of course are reading. At the end he says something like, "And today Howard Campbell hung himself in his cell. Auf Weidersien." To those of you who know German that doesn't mean goodbye, it means until we meet again. So is he actually killing himself or is he killing "Howard W. Campbell the Nazi". Nobody knows. Even the movie with Nick Nolte made back in the 90's leaves this rather open ended and open to interpretation.
Throughout the movie he is seen smoking heavily, not that it matters now but will play a part later. The final scene in the movie shows him fashioning a noose out of the typewriter ribbons, he sets it up and as he's about to kill himself the camera pans away so we see a pair of hands resting on the bars of the door. We hear him jump, the person at the door blows out a stream of smoke and the movie ends.
Not to say that any of this is true, but the timing of it just reeks of somebody playing a game.