Though not impossible in the Soviet world. One of the guys who ran the failed 1991 coup, the one who knew where all the gold reserves were, shot himself in the head four or five times. Another one jumped to his death backwards off his balcony. There was even a prisoner who managed to slit his own throat while his hands were tied behind his back. The rule is that when people in that part of the world REALLY want to kill themselves, they manage to do it. And because it's suicide they close the file instead of dusting for prints.