The newly unearthed diaries of a colourful assassin for the wartime Office of Strategic Services (OSS), the forerunner of the CIA, reveal that American spy chiefs wanted Patton dead because he was threatening to expose allied collusion with the Russians that cost American lives.
But after a decade-long investigation, military historian Robert Wilcox claims that OSS head General "Wild Bill" Donovan ordered a highly decorated marksman called Douglas Bazata to silence Patton, who gloried in the nickname "Old Blood and Guts".
His book, "Target Patton", contains interviews with Mr Bazata, who died in 1999, and extracts from his diaries, detailing how he staged the car crash by getting a troop truck to plough into Patton's Cadillac and then shot the general with a low-velocity projectile, which broke his neck while his fellow passengers escaped without a scratch.
Mr Bazata also suggested that when Patton began to recover from his injuries, US officials turned a blind eye as agents of the NKVD, the forerunner of the KGB, poisoned the general.
Extraordinary. Stalin -- the biggest killer and rapist of the war -- and America, its biggest profiteer, in collusion at the expense of cannon fodder GI lives?