Following the German invasion of Poland, the Keser Torah yeshivas disbanded and the Rebbe escaped to the town of Alexander, but from there was most likely sent by the Nazis into the Warsaw Ghetto. His son-in-law, Rabbi Dovid Moshe Rabinowicz, was also incarcerated in the Warsaw Ghetto, where he continued to deliver shiurim to Keser Torah students. The Rebbe and all the members of his family, including his only daughter, son-in-law, and their infant son, were shot to death during the Aktion of 1 August 1942. They were buried in a mass grave in Warsaw's main cemetery. With the Rebbe's death, the father-to-son lineage of Radomsker rebbes came to an end. (The Rebbe's brother, Rabbi Elimelech Aryeh Hakohen Rabinowicz, died in Mauthausen.Rabinowicz, Tzvi, The World of Hasidism, p. 175.)
