AnDie -- There's a disagreement on the dates (see below). I've found three different versions.
(1) Version 1 -- imprisoned in Ljubljana from Mar 1946; put on trial at Belgrade by a Yugoslav Army court; convicted and sentenced to death by hanging 21 Aug 1946; executed 4 Sept 1946 at Ljubljana, Slovenia, Yugoslavia (Axis Biographical Research, SS und Deutschen Polizei [SS and German Police], http://www.geocities.com/~orion47/SS-PO ... izei.html;
History of the United Nations War Crimes Commission and the Development of the Laws of War p. 532, United Nations War Crimes Commission, London: HMSO, 1948);
(2) Version 2 -- sentenced to death for war crimes 30 Aug 1946; hanged 4 Sept 1946 (NYT 31 Aug 1946:3:1; NYT 9 Sept 1946:3:4). [The NYT issue on the executions was published Monday, 9 Sept 1946; according to my "perpetual calendar," the preceding Wednesday was 4 Sept 1946.]
(3) Version 3 (post by Octavianus) -- put on trial by the Military court of the 4th Yugoslav Army at Ljubljana (10th Process) with at least 13 other German and Slovene officials; convicted and sentenced to death 19 or 21 Jul 1946.
Here are scans of the NYT articles on the conviction and execution of Roesener:
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