In the subsequent trial, the witness justified the denunciation with her hatred of priests, "because they were opponents of National Socialism".

Roland Freisler sentenced Kirchhoff to death on March 7, 1944 at the People's Court in Berlin.

Kirchhoff himself submitted written requests for clemency, set up and promoted by Carl Anton Baumstark, along with a group of theologians and orientalists from various universities.

After the war, the intercession of the Apostolic Nuncio Cesare Orsenigo, the head of the Episcopal Commissariat of the Fulda Bishops' Conference in Berlin, Heinrich Wienken, and the Paderborn Bishop Lorenz Jaeger can be heard.

Nonetheless, Kirchhoff's death sentence was carried out on April 24, 1944 in Brandenburg-Görden by beheading.