[1] Nitsche was condemned to death for crimes against humanity for killing over one thousand people, and guillotined in March 1948 in Dresden.

Being well established, Nitsche was no longer motivated by the prospect of career advancement but was rather ideologically committed when he later joined Action T4.

In 1940 he became deputy director of the Action T4 Medical Office (German: Medizinische Abteilung) under Werner Heyde, which had a front organization called the Reich Cooperative for State Hospitals and Nursing Homes (German: Reichsarbeitsgemeinschaft Heil- und Pflegeanstalten) that handled the registration, evaluation, and selection of patients for adult euthanasia.

[4] As the T4 program's chief physician,[4] Nitsche was responsible for corresponding with mental health institutions about registering and transferring patients to be euthanized.

He was condemned to death for crimes against humanity on the basis of Allied Control Council Law No.