Father Martin “Marty” Zielinski, 71, died June 25. He was a retired associate professor in the Department of Church History at the University of St. Mary of the Lake/Mundelein Seminary.

Born in Denver, Father Zielinski attended Quigley Preparatory Seminary, Niles College and the University of St. Mary of the Lake/Mundelein Seminary before being ordained in 1978.

His first pastoral assignment was at St. Margaret of Scotland Parish. He then attended Catholic University of America in Washington, D.C., where he earned a doctoral degree in American Catholic church history in 1989.

He then was assigned to Mundelein Seminary as an associate professor of church history. He spent more than 30 years at the University of St. Mary of the Lake/Mundelein Seminary, where he took on spiritual direction, teaching and administrative responsibilities, including one term as academic dean.

Throughout his time at the University of St. Mary of the Lake/Mundelein Seminary, he assisted at St. Patrick Parish in Wadsworth (now St. Brigid Parish-Church of St. Patrick). He wrote many scholarly articles published in the U.S. Catholic Historian, the Encyclopedia of American Catholic History and Chicago Studies.

Zielinski also contributed to the collection “Black and Catholic” published by Marquette University Press. In the past three years, he accomplished a special contribution to American Church History, which was a transcription and annotation of the diary of Bishop William Quarter, who was the first bishop of Chicago. Zielinski also wrote the text for the Litany of American Saints, Blessed and Venerables, which was set to a musical composition. It premiered at the seminary on Dec. 8, 2022, the feast of the Immaculate Conception, and was recorded in February  2023, sung by the seminary choir.

Deacon Charles P. O’Donnell, 89, died June 18. He was ordained in 1983 and served at Our Lady of Ransom Parish, Niles, and as co-associate director of the archdiocese’s Diaconate Office.

The son of Irish immigrants, Deacon O’Donnell lost his father when he was 2 years old. He was married to his late wife, Lindy, for 64 years.

As a deacon, he officiated at marriages, baptisms and gravesite services, and mentored many younger deacons.

He is survived by his children Charles Patrick O’Donnell Jr., Stephen Gerard O’Donnell, Kathleen Guzman and Patricia Ann Patke; eight grandchildren; two great-grandchildren; and his sister, Patricia Ann Holochwost.

Sinsinawa Dominican Sister Mary Pat Marcos, 104, died June 11 in Hazel Green, Wisconsin.

Before entering the community, as Patricia Zimbriski, she served in the U.S. Air Force from 1943 to 1946, stationed in Florida and the Pentagon, where she held a top-secret position. She also worked for United Artists Corporation, Milwaukee, for 12 years before entering religious life.

Sister Mary Pat made her first religious profession in 1962 and her perpetual profession in 1968. She was a teacher and support staff member and worked in social services in Illinois, Wyoming, Wisconsin, Texas and California.

In the Archdiocese of Chicago, Sister Mary Pat served as secretary at Rosary College (now Dominican University), River Forest (1962-1965, and as secretary to the dean at DePaul University (1970-1973). She taught at Epiphany (1969-1970); St. Vincent Ferrer, River Forest, (1973-1976); and Trinity High School, River Forest, 1978-1982.

Adrian Dominican Sister Elizabeth Ann (Marie Berge) Demirgian, 91, died May 2 in Adrian, Michigan.

Born in New York, she was in the 64th year of her religious profession.

Sister Elizabeth Ann ministered in education and as a physician’s assistant in Michigan, Florida, Illinois and Tennessee.

In the Archdiocese of Chicago, she taught at Regina Dominican High School.

Adrian Dominican Sister Kathryn “Kate” (Michael Ellen) Hartnett, 88, died May 11 in Adrian, Michigan.

Born in Chicago, she was in the 70th year of her religious life.

Sister Kate ministered in elementary education, as a development director and hospital volunteer in Michigan and Illinois.

In the Archdiocese of Chicago, she taught at Queen of Apostles, Riverdale (1957-1960); St. Rita (1960-1965); St. Columbanus (1965-1968); and St. Mary Star of the Sea (1968-1972). She was principal (1972-2004) and director of development (2004-2006) at St. Ailbe, and a volunteer at Trinity Advocate Hospital (2007-2013).