Tötungsanstalt Pirna-Sonnenstein

His fellow student from Würzburg, Aquilin Ullrich, in the meantime as a doctor in the National Socialist "Euthanasia" program (referred to as "Action T4" in post-war use) and worked in the Nazi killing facility in Brandenburg, recommended to the medical director of the organized hospital, Werner Heyde, for a cooperation in the T4 organization.

Endruweit, who had been promoted to an assistant doctor in September 1940 and, in contrast to his former colleagues, did not become a member of the NSDAP, agreed to do so and was as "U.K." (indispensable) from November 22, 1940 in the Sonnenstein killing facility in Pirna under which Horst Schumann.

In 1936 Nitsche introduced a hunger for patients in Pirna-Sonnenstein on their own initiative, which according to his pedigree hygiene ideas as "ballast existence" presented an unnecessary financial burden on society. At the beginning of 1939, the head of the "Volkspflege" department in the Saxon Ministry of the Interior, Alfred Fernholz, pushed to the fact that the hunger mast applied by Nitsche should be introduced in other Saxon state institutions.

From 1914 to the beginning of 1918, Nitsche was a provisional director in Pirna at the Heil- und Nursing Institute at Sonnenstein Castle.

On August 1, 1928, he returned there as a director. He worked on scientific questions about hereditary biology and forensics.

Nitsche remained a medical director in Pirna until the conversion of the healing and nursing institution to a killing facility for action T4.