I don't know if this was the Prince Radziwill referred to:
" Wiesenthal arrived there on the frozen night of February 15, 1945. In The Murderers Among Us, he tells how he and a fellow prisoner, Prince Radziwill, linked arms to make the last four miles uphill to the camp. The effort was too great and they collapsed in the snow. An SS man fired a shot that landed between them. As the two men did not get up, they were left for dead in the sub-zero temperature. When lorries arrived to collect those who had died on the march, the unconscious Wiesenthal and Radziwill were so frozen that they were thrown onto a pile of corpses. At the crematorium, however, the prisoners unloading them realised they were alive. They were given a cold shower to thaw out and Wiesenthal was taken to Block VI, the “death block” for the mortally ill."