I believe he died in Shanghai during the Japanese occupation:
For one young couple, tragedy struck in May 1944 when the husband, “Morris” (likely Maurice Weill), became suddenly ill with “tuberculosis meningitis” for which there was no cure. He had to be sent out to a hospital for infectious diseases in Shanghai. Dr. Keith Graham asked permission to accompany Morris’s wife, Esther, across the Huangpu River to visit him, but the Japanese Commandant refused. When word came on 28 May that Morris was dying, Graham took Esther Weill to the Commandant to plead her case with him. She fell on her knees before him and with tears rolling down her cheeks, begged him to let her go just this once to see her husband. The Commandant reportedly “looked at her coldly and said, ‘My wife and children are in Japan, and I want to see them too, but I cannot. Neither can you; we are at War.” The next day Morris Weill died.
Page 188, China Interrupted: Japanese Internment and the Reshaping of a Canadian ...