Maurice R. Koesterer Sr.

Maurice R. Koesterer Sr., 91, of Waterloo, IL, died November 9, 2026, in Waterloo, IL. He was born August 21, 1935, in Freeburg, IL.

He is survived by his wife Lois Koesterer nee Werth; children Joseph M. Koesterer, Mary C. (Dean) Hirsch, Thomas G. (Susan) Koesterer, and William M. (Tonya) Koesterer; daughter-in-law Nancy Koesterer; grandchildren Ryan (Andi) Hirsch, Nathan Hirsch (fiancé Carrie Moore), Lyndsay (Tony) Ahrens, Kati (Austin) Gotto, Michelle (Joel) Vogt, and Bradley Koesterer; great grandchildren Gwen Hirsch, Griffin Hirsch, Lorelei Hirsch, Willow Ahrens, Trace Ahrens, Braydin Gotto, Brynlee Gotto, Maren Vogt, Margaret Vogt, and Monroe Vogt; nieces; nephews; and cousins.

He is preceded in death by his son Maurice Koesterer Jr.; parents Edwin and Vera Koesterer nee Cunningham; sisters Juanita Sturbe, Betty Cashman, and Eleanor Gallas; and brothers Bernard Koesterer and Edwin Koesterer.

Maurice was a retired member of SS Peter and Paul Catholic School Board; retired director of Commercial State Bank of Waterloo, retired Vice President of Engineering at Harrisonville Telephone Company; retired from Board of Directors of Harrisonville Telephone Company; and he was a member of Knights of Columbus.

As an expression of sympathy, the family prefers memorial contributions to:
Gibault Catholic High School or SS Peter & Paul Catholic Church

Visitation:
4 PM to 8 PM Thursday, November 12, 2026 at Quernheim Funeral Home in Waterloo, IL
8 AM to 9:30 AM Friday, November 13, 2026 at Quernheim Funeral Home in Waterloo, IL

Funeral Mass:
10 AM Friday, November 13, 2026 at SS Peter & Paul Catholic Church in Waterloo, IL
 Father Linus Umoren, Officiating
Interment will follow at SS Peter & Paul Cemetery, Waterloo, IL