Donald S Koesler

Donald “Don” Steven Koesler, 79, of Mount Morris, IL, passed away on Sunday, November 30, 2025, at Rose Senior Living Providence Park in Novi, MI.

Don was born on August 6, 1946, in Dixon, IL to Charles and Helen (Wasmund) Koesler. He married Jane Susan (Wiswell) Koesler on March 21, 1970, and together they shared many wonderful years. She preceded him in death on December 23, 2005. In the years that followed, Don was blessed to find another meaningful relationship with Karen Miller of McConnell, IL, who lovingly supported and cared for him for many years.

Don devoted his career to education, spending many years as a math teacher at Reagan Middle School in Dixon, IL, and Dixon High School. He took pride in his work and in helping students master skills that would serve them throughout their lives. He found lifelong enjoyment in the outdoors and was an avid hunter and fisherman in his younger years. In later years, he found comfort and peace during his many walks in nature. He was also an active member of the Mt. Morris Church of the Brethren, where he found fellowship and an opportunity to express his strong faith in the Lord.

Don is survived by his two children, Paul (Debra) Koesler of New Hudson, MI, Leslie Blyakhman of Chanhassen, MN; 5 grandchildren, Allison Koesler, Benjamin Koesler, Clara Koesler, Ryan Blyakhman, Laura Blyakhman; his brother, Ronald Koesler of Franklin, TN; and his long-term partner of 9 years, Karen Miller of McConnell, IL.

A visitation will be held at Finch Funeral Home in Mt. Morris, IL, on Sunday, December 7th from 4:00pm-6:00pm. The memorial service will be Monday, December 8th at 10:00am at Finch Funeral Home in Mt. Morris, IL. Burial will follow at 11:30am at Chapel Hill Cemetery in Dixon, IL.

In lieu of flowers, memorial donations may be made in memory of Donald Koesler to the Dixon Park District, 1312 Washington Ave., Dixon, IL 61021.

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