Catherine E. (Reiss) Siener

Catherine Elaine Siener, age 82, of O’Fallon, Missouri, passed away on November 10, 2025. She was born on October 24, 1943, in St. Louis, Missouri, to the late Paul and Ethel (née Wamhoff) Reiss.

Catherine graduated from St. Thomas Aquinas High School. In 1963, she married the love of her life, Ronald Louis Siener, and together they shared 43 wonderful years of marriage until his passing in 2005. When Ronald was drafted into the U.S. Army, the couple was stationed in Hawaii, where they created cherished memories and welcomed their first daughter, Colling. After returning to Florissant, Missouri, in 1975, their family grew with the birth of their second daughter, Nicole.

Catherine was a dedicated and valued employee of Cuivre River Electric Cooperative, where she worked faithfully for over 30 years. 

A loving mother and grandmother, Catherine’s greatest joy came from spending time with her family-especially her beloved grandchildren, Zachary and Caitlin. She adored sharing in their milestones and was immensely proud of the people they became.

Catherine found joy in antique shopping, tending to her beautiful flower garden, and volunteering at St. Patrick Catholic Church. 

Catherine is survived by her daughters, Colling Siener and Nicole (Dave) Lowman; her grandchildren, Zachary (Paige) Redfern and Caitlin (Sean) Redfern; and many extended family members and friends who loved her dearly. She was preceded in death by her parents, Paul and Ethel Reiss; her husband, Ronald Louis Siener; and her sister, Peggy Ann Orr.

Memorial donations may be made to: Operation Round Up-Please make checks payable to: Cuivre River Electric Community Trust (communitycouncilstc.org/give/donate), 1112 East Cherry Street, Troy, MO 63379

A Celebration of Life will be held on December 6th from 12-5pm. Please contact Nicole at Nicole.Siener@gmail.com for additional information.

The family is being served by Pitman Funeral Home in Wentzville.

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