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January 23, 1894
|Died||July 25, 1945(aged 51)|
|Cause of death||Suicide|
|Occupation||Schutzstaffel (SS), Sicherheitsdienst (SD);|
|Known for||Arresting Anne Frank|
|Political party||National Socialist German Workers Party (Nazi Party)|
Dettmann was a member of the Nazi Party (NSDAP) and his Party number was 722,240. Thereafter, he joined the Schutzstaffel (SS); his SS number was 414,783. He was attached to Section IVB4 or the Gestapo, after having served in Poland and Russia. He was stationed in Amsterdam during the German occupation of the Netherlands and was promoted to SS-Obersturmführer (lieutenant) on November 9, 1942. On August 4, 1944, he received a phone call reporting that there were Jews hidden on the premises at 263 Prinsengracht in Amsterdam. The people in question were Anne Frank, her parents, sister, and four others. He immediately dispatched a squad led by SS-Oberscharführer (staff sergeant) Karl Silberbauer, telling Silberbauer that the call had come from "a reliable source". Silberbauer and his contingent of NSB plain-clothes officers raided the building and arrested the eight in hiding who, after questioning at SD headquarters, were deported to the Westerbork transit camp and from there, to the Auschwitz concentration camp.
After the war in Europe ended, Dettmann was arrested in the Netherlands and remained a prisoner of war. However, he took his own life in Amsterdam at the "Havenstraat prison", on July 25, 1945, at 4.00 AM, before being presented to court. He never revealed who betrayed those in the annex, and was probably never questioned about it; the query did not become a point of interest until long after Dettmann's suicide.
- "Karl Josef Silberbauer (Dutch)". Het verraad van Anne Frank. Retrieved 14 June 2014.