Emil en Clementine Metzger committed suicide on the 18th of May, 1940 by taking veronal. Emil died directly and his sister, Clementine died 2 days later on the 20th of May, 1940 .
Brother and sister were burried on the Jewisch cemetery in Diemen.
Source: Lucas Ligtenberg, “Mij krijgen ze niet levend” Uitgeverij Balans 2017, ISBN 978 94 600 3845 7