Gertrud Loewenthal-Valentin committed suicide in camp Westerbork.
Oorlogsarchief Nederlandse Rode Kruis (War archives of the Dutch Red Cross), Coll. Westerbork, nr. 298
Gertrud Loewenthal-Valentin died on 29 June 1943 in Westerbork transit camp and she was cremated on 1 July 1943. The urn with her ashes was placed on the Jewish cemetry in Diemen on field U, row 9, grave nr. 18.
Register van joden die in het kamp Westerbork zijn gecremeerd, 1943-1944; archief van de gemeente Westerbork, opgenomen in het archief van de gemeente Midden-Drenthe te Beilen, inv. n 3789