Leonard Spijer got married to Elisabeth Rosalie Maas on 11 March 1942.
Addition of a visitor of the website
According to the Sterbebücher of Auschwitz Leonard Spijer died on 21 september 1943. It is possible this date is different from the official day of death as established after the war by the Department of Justice.
For additional information see the website of The State Museum Auschwitz-Birkenau.