Presumable this person is commemorated on a memorial in Vierhouten. More information on this memorial can be found (in Dutch) on the website of the Nationaal Comité 4 en 5 mei.
Willem Kaas was the son of Izaak Kaas and Judith Content. He was married to Judith Wurms. The couple lived at 259 Vrolikstraat in Amsterdam. On 16 March 1943 Willem Kaas died in Vught concentration camp.
Records concentration camp Vught, Sterbebuch 1943
In addition, a Jokos file (number 3066) on th…