He is believed to have been the German spy who remained undetected for the longest period after arrival. "A Nazi spy who killed himself after supposedly being sent to the UK on a mission to assassinate Winston Churchill will finally get a headstone on his unmarked grave. William Ter Braak shot himself in the head in 1941 fearing he was going to be exposed after spending several months spying on Britain for Hitler. The death of the Dutch-born agent was covered up by the wartime British authorities who feared a public scandal and he was buried secretly in an unmarked grave. Now parish councils have finally agreed to allow a headstone to be erected on his grave at Great Shelford, Cambridgeshire, following a request from relatives in the Netherlands. Much mystery still surrounds the death of Ter Braak - born Engelbertus Fukken. He is believed to have been parachuted into Britain on a mission to assassinate the wartime leader in 1940. Carrying false papers and a radio transmitter in a small suitcase, he found lodgings with a couple in Cambridge. But a few months later, in 1941, running short of money and reportedly fearing he had been discovered, he committed suicide in an air-raid shelter under Christ's Pieces park, near the city centre. The death was hushed up, with a local funeral director instructed to back up his van to the shelter door to smuggle the body away." Nazi spy gets a headstone on unmarked grave in UK | Daily Mail Online