Fr. Donald L. Dietz, OMI

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Fr. Donald L. Dietz, OMI, 93, died Wednesday, September 21, 2022, in Belleville, IL.

Fr. Don was born in Rock Island, IL, on May 6, 1929, to the late Leo and Irene, nee Suhl, Dietz.

He made his first vows as an Oblate of Mary Immaculate on August 15, 1950, and was ordained on April 6, 1957.  He is celebrating his 65th year of priesthood. He spent 10 years as a parish priest in the Scandinavian Delegation and was a Professor of Theology at various locations including Washington DC, San Antonio, TX, and St. Paul, MN, for almost 20 years. Fr. Donald was instrumental in forming the Ecumenical Movement in Sweden. He was also a paritus, or chosen advisor, to one of the counsel fathers during the Second Vatican Council. He was fluent in several languages including Swedish, French, Italian, and Spanish.

He spent the latter part of his ministry as a parish priest at St. Francis de Sales (Chelan, WA) St. Francis Church (Tuscaloosa, AL), St. Aloysius Church (Bessemer, AL) St. Peter’s Parish (Volo, IL) and Handmaids of the Precious Blood (Lake Villa, IL) before he moved to St. Henry’s Oblate residence and finally to the Benedictine Living Community in Belleville, IL where he resided at the time of his death.

Fr. Dietz was preceded in death by his parents, Leo and Irene Dietz; a brother, Jack; and a sister, Jeanne Cunningham.

Surviving are a sister, JoAnn Spears; friends and Missionary Oblates of Mary Immaculate; and many nephews and nieces.

 In lieu of flowers, memorials may be made to the Missionary Oblates of Mary Immaculate USA, 9480 North De Mazenod Drive, Belleville, IL 62223. Condolences may be expressed online at

Visitation:  Friends may visit from 10 to 11 a.m. Wednesday, September 28, 2022, at 726 Community Drive, Belleville, IL 62223, at the Benedictine Living Community Chapel.

Funeral:  A Mass of Christian Burial will be at 11:15 a.m. Wednesday, September 28, 2022, at 726 Community Drive, Belleville, IL 62223, at the Benedictine Living Community Chapel.

Burial will be at St. Henry’s Oblate Cemetery in Belleville, IL, following a luncheon.



5 Comments on Fr. Donald L. Dietz, OMI

Rev. John Arthur Orr said : Guest Report Jan 09, 2024 at 4:43 PM

God rest Father Don! I found out today that he was called home to be with the Lord. Father Don taught me and many others not only how to think but also how to be a son of Mother Church. Prayers for his eternal repose and all who mourn his passing.

  • Athens
  • TN
Tamara Kurtz said : Guest Report Oct 15, 2022 at 1:58 PM


  • spring grove
  • IL
John Robin said : Guest Report Oct 06, 2022 at 9:37 PM

My wife and I knew Fr. Dietz for only about a year, in 2000-2001, but he welcomed us warmly into his parish and provided us such beautiful priestly support. He was a wonderful priest. Rest in peace, Father Donald!

  • Lombard
  • IL
DeeDee Dietz said : Guest Report Sep 24, 2022 at 8:18 PM

Uncle Don was the kindest and sweetest man ... just like my Dad ❤️ I've always been in awe of his accomplishments but I also was very fortunate to call myself his niece 🙂 So many great memories! RIP, you will be missed 💔

  • Bradenton
  • FL
Angela Jaeckel-Weingarten said : Guest Report Sep 24, 2022 at 6:24 PM

My dearest sympathy to his family and friends. Jesus wants to be your friend. Father Dietz was one of my dearest friends. God speed my dear Father. Angela

  • Volo
  • Illinois

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