Jędrzejewski was born in Kowal, Poland, and was the youngest of six children. He entered the seminary in Wloclawek, was ordained a priest on June 18, 1911, and then served in parishes in Zadzimia, Poczesna, and Kalisz. He also served as a prison chaplain, as a high school prefect, and also was devoted to youth work.
After the outbreak of World War II, Jędrzejewski was arrested on August 26, 1940 and was taken to a transit camp in Szczeglinie and then to Sachsenhausen concentration camp. On December 14, 1940 he was sent to Dachau, where he refused to renounce the priesthood to regain freedom and died from debilitating work on August 29, 1942.
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