The following death certificates from Theresienstadt1 show that Dr David Königsberger and his wife Toni (nee Cassirer) died at Theresiensdtadt on 30 Oct 1942 at 5.00 pm and 4.50 pm respectively, allegedly of pneumonia and heart disease respectively. The cause of death however may be inaccurate.
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1 Thanks to Irene Newhouse who found out that all the Theresienstadt death certificates have been digitized & can be searched at http://www.holocaust.cz/cz2/victims/victims. Since it's in Czech, one must first go to: http://google.com/translate_t, & insert the above URL into the translate a web page box, remembering to select Czech from the languages. It is thus possible to search in English, though large chunks of stuff are not translated. ⇑