Jesus declares: “I am the light of the world. Whoever follows me will never walk in darkness, but will have the light of life.” – John 8:12
Sister Dorothy Jean Casey, 86, a Sister of Charity of Leavenworth (SCL) for 69 years, died October 9, 2026. Known affectionately as Sister Deedee, she devoted her life to education, pastoral ministry, and helping others recognize God’s presence in their everyday lives.
Born November 5, 1939, in Helena, Montana, Dorothy Jean was one of eleven children of Francis Charles and Loretta Amelia (née Daum) Casey. She grew up in East Helena in a large, close-knit Catholic family, where faith, prayer, and family life were inseparable. Her childhood was filled with simple pleasures, from gardening and fishing trips to family picnics and celebrations. She especially treasured her parents’ example, who taught their children the importance of generosity, prayer, and caring for others.
Sister Deedee attended Saint Anne School in East Helena and Cathedral High School in Helena. During high school, she began to feel drawn to religious life, inspired by the Sisters who taught her and by her older sister, Lynn, who had already entered the SCL Community. Although she enjoyed the social activities of her teenage years, she felt increasingly called to something more.
On August 20, 1957, shortly after graduating from high school, she entered the Sisters of Charity of Leavenworth. She professed her first vows on August 22, 1959, and her perpetual vows on August 22, 1965. Before returning to her baptismal name, she was known as Sister Dennis Casey.
Sister Deedee began her ministry in elementary education, teaching in Catholic schools across the country. Her assignments took her to Missouri, Illinois, Colorado, California, Kansas, and Montana. She spent much of her teaching career in the first grade, finding particular joy in helping young children discover both the world around them and their relationship with God.
She embraced the changes in religious education that followed the Second Vatican Council, encouraging children to experience their faith through prayer, symbols, rituals, and personal reflection. She especially enjoyed helping children create their own prayer spaces and involving families in their children’s faith formation.
After more than two decades in the classroom, Sister Deedee felt called to a different form of education and ministry. Returning to her beloved Montana, she served in religious education and pastoral ministry at Saints Cyril and Methodius Parish in East Helena and Holy Rosary Parish in Bozeman. Her work expanded to include adult faith formation, sacramental preparation, retreats, and helping parishioners develop a greater understanding of their faith.
Sister Deedee earned a bachelor’s degree in education from Saint Mary College in Leavenworth in 1972 and a master’s degree in ministry, with an emphasis on spirituality, from Seattle University in 1987. Her graduate studies strengthened her interest in adult spiritual formation and the importance of building communities of faith.
Family remained central to Sister Deedee’s life. In 1994, she received permission to step away from full-time ministry to help care for her aging parents. She considered this time a blessing and an opportunity to give back to the people who had given so much to her. She treasured the chance to share in their daily lives, care for their needs, and bring family members together.
Following her parents’ deaths, Sister Deedee resumed her pastoral ministry, serving at Holy Rosary Parish in Billings and later as director of pastoral care and mission effectiveness at Saint James Community Hospital in Butte, Montana.
Her ministry eventually led her to Saint Vincent Healthcare in Billings, where she served in ministry formation and helped employees understand the spiritual dimensions of their work. She developed educational programs focused on the history, spirituality, mission, and values of the Sisters of Charity of Leavenworth. Through various initiatives, she encouraged health care workers to see their daily responsibilities as more of a ministry than a job, recognizing opportunities to serve others with compassion and dignity.
Sister Deedee believed that spirituality was part of daily life, showing up in relationships, attitudes, choices, and the way people treated one another. Her work touched employees throughout the health care system, helping them recognize the meaning and purpose of their service.
After retiring from full-time ministry in 2008, Sister Deedee continued to volunteer. She returned to Leavenworth in 2019 and remained active in the SCL Community. In her later years, she embraced her call to the Prayer and Presence Ministry, continuing to offer her gifts through prayer and companionship.
Throughout her life, Sister Deedee lived in a spirit of gratitude, curiosity, and openness to new experiences. She loved gardening, photography, and the beauty of the outdoors. She also treasured friendships and the many people who became part of her life through teaching, ministry, and community.
Reflecting on her vocation, Sister Deedee once wrote, “My life as a Sister of Charity is one I wouldn’t trade for any other. I looked for adventure and a way to live creatively, and I found it by falling in love with the Lord over and over again.”
Sister Deedee was preceded in death by her parents; her sisters, Sister Donna Lynn Casey, SCL, Patricia Casey Child, and Colleen Marie Casey Stroup.
She is survived by her brothers, Dennis Casey of East Helena, Montana; Michael Casey of Clancy, Montana; Tom Casey (Terrie) of East Helena, Montana; and Jim Casey (Brenda) of East Helena, Montana. She is also survived by her sisters, Mary Chambers (Chuck) of East Helena, Montana; Jerry Ann Maddio of East Helena, Montana; and Kathy Zoanni (Dick) of Billings, Montana; as well as many nieces, nephews, and extended family members.
A vigil service will be held at 4 p.m. on Tuesday, October 27, in Ross Chapel at the Mother House in Leavenworth. A rosary will be prayed at 9:45 a.m. Wednesday, October 28, followed by the Mass of Christian Burial at 10:30 a.m. Interment will follow in Mount Olivet Cemetery on the Mother House grounds. Memorial contributions may be made to the Sisters of Charity of Leavenworth Retirement Fund, 4200 S. 4th St., Leavenworth, KS 66048.
