Carl Heijmann committed suicide in camp Westerbork.
Oorlogsarchief Nederlandse Rode Kruis (War archives of the Dutch Red Cross), Coll. Westerbork, nr. 298
Carl Heijmann died on 29 June 1943 in Westerbork transit camp and he was cremated on 1 July 1943. The urn with his ashes was placed on the Jewish cemetry in Diemen on field U, row 9, grave nr. 12.
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