In the last year of peace in 1939, Thea Sandten married a Jewish fellow citizen called Löwenstein and lived until the end of 1942 under very difficult conditions in the German Reichshauptstadt Berlin. When the deportation wave initiated by the National Socialists hit the still remaining Berlin Jews in the following winter, Thea Sandten, reported last as Toni Löwenstein, was dragged to the Auschwitz extermination camp on December 9, 1942, where she was murdered in Januar 1943.