In 1988 Sayer was asked by Jeff Rooker to investigate a claim by one of his constituents that a regimental aid fund , established in World War II , was not benefitting the former POWs it had been established to care for . Sayers ’ subsequent enquiries established that Rooker 's constituent had been a survivor of the Wormhoudt massacre , the murder of nearly 90 unarmed British troops in 1940 by members of the Infantry Regiment Leibstandarte SS Adolf Hitler , during the retreat to Dunkirk . Rooker 's file contained a picture of the SS officer , allegedly responsible for the crime , who had disappeared at the end of the war . Sayer recognised the officer as SS General Wilhelm Mohnke who had been responsible for the defence of the underground bunker complex in which Adolf Hitler committed suicide . Sayer 's subsequent investigation linked Mohnke with other World War II atrocities including the murder of unarmed Canadian soldiers taken prisoner during the Normandy invasion and the infamous Malmedy massacre of unarmed US prisoners of war during the Battle of the Bulge
Wormhoudt massacre
Wormhoudt massacre
Ian Sayer