Majdanek concentration camp
In the spring of 1943 he was arrested by the Gestapo for harboring Jews, specifically for providing Jews with more than 600 baptismal certificates (alternative date from another source: He was arrested by the Gestapo on December 20th, 1942). On March 25, 1944 he died in the infirmary of Majdanek concentration camp near Lublin, Poland.