Henry Tandey could have changed the course of history if he would have not let Adolf Hitler walk free during the First World War.
After discovering that he was the man who let Hitler live, Tandey felt guilty that he could have saved the 560-plus lives lost that night, all the horror wreaked by the Nazis and the 60million lives lost in the Second World War, the Mirror reported.
It was the biggest "what if?" in history and, until his death in 1977 at the age of 86, Tandey had to live with the stigma of being "The Man Who Didn't Shoot Hitler".
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