Jacob Hes died on 11 June 1943 in Westerbork transit camp and he was cremated on the same day. The urn with his ashes was placed on the Jewish cemetry in Muiderberg on field V, grave nr. 86.
Register van joden die in het kamp Westerbork zijn gecremeerd, 1943-1944; archief van de gemeente Westerbork,…
In addition, a Jokos file (number 10371) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.