As an Officer cadet, shortly before his promotion to Lieutenant, he warned the father of his girlfriend about being on a wanted list for the latter's membership in the Communist Party, thus helping him to flee.
In January 1942, after almost 20 years as a prisoner, he was made a trustee and inmate nurse in the newly founded "KZ Buchenwald Experimentierstation", a quarantine station in Block 46 for medical experiments with the highly infective epidemic typhus better known as spotted fever.
There, he worked as a clerk and received on the job nurse training under SS doctors (KZ Lagerärzte) Erwin Ding-Schuler and the latter's temporary deputy Waldemar Hoven.
Several witnesses gave statements for his defense, among them two British Officers and the future diplomat and philosopher Stéphane Hessel, all three of whom had been on death row under the Nazis; Dietzsch had saved their lives by giving them identities of dead prisoners and hiding them in the quarantine station.
After a media campaign of former Buchenwald inmates Werner Hilpert and Eugen Kogon, who made his connections with the KZ underground known as well as lobbying by journalists and resistance members Marion Gräfin Dönhoff and Kurt Schumacher, Dietzsch was released from prison in 1950.
Having found belated happiness with his wife Lilly, née Endryat, he spent the remainder of his life corresponding with former KZ inmates and organizations of former political prisoners and members of the resistance.
His life story was literarily processed by Ernst von Salomon in Das Schicksal des A. D. - Ein Mann im Schatten der Geschichte and published in 1960.