The date mentioned here is the legal date of death stated by the Ministry of Justice.
New information shows that Herman de Leeuw was deported from Westerbork to Sobibor in 1943. There he was selected for forced labour. From Sobibor he was deported to ZAL Tschentstocau. December 1944 he went to K.L. Buchenwald en from there in January 1945 to K.L. Mittelbau. In the Totenbuch from KZ Mittelbau-Dora 23 March 1945 is mentioned as the date of death of Herman de Leeuw.
Source: Dutch Red Cross, Totenbuch from KZ Mittelbau-Dora
Biography