 His further fate, including the date, location and manner of his death are unknown.At the beginning of 1944 he and his family were probably killed by one of the German Einsatzgruppen near Krosno (in southern Poland) where he was hiding after the liquidation of the ghetto in Wieliczka.Most of Koffler's unpublished scores vanished in the turmoil of the Second World War, when he died in the Holocaust.