Christian 09

Della M. Koster

July 4, 1924 ~ March 18, 2020 (age 95)


Della M. Koster, 95, of Rock Island, passed away on Wednesday, March 18, 2020 at her home. Graveside services for Della will be 11 am, Saturday at Calvary Cemetery, Rock Island. Due to the COVID-19 Pandemic, a Memorial Mass will be held at Sacred Heart Catholic Church, Rock Island at a later date. Wheelan-Pressly Funeral Home and Crematory, Rock Island is assisting the family. Memorials may be made to the American Diabetes Association or to the American Cancer Society.

Della was born on July 4, 1924 in Dubuque, Iowa, a daughter of Roy and Martha (Frye) Edminster. She married Leo Koster on December 29, 1945 in Dubuque. He preceded her in death on September 24, 1998. Mrs. Koster worked as a supervisor at Jaydon Inc., Rock Island for 24 years before her retirement. She was a member of Sacred Heart Catholic Church, Rock Island and the Fraternal Order of the Eagles, Aerie No. 956, Rock Island. Della enjoyed sewing, traveling, reading and spending time with her family.

Survivors include her children, Donna “Mitzi” (Robert) Christenson, Rock Island, Donald (Candy) Koster, Rock Island, and Timothy (Joanne) Koster, Illinois City; four grandchildren; seven great grandchildren; six great-great grandchildren; and a brother, Rodney (Diane) Edminster, Dubuque.

Della was preceded in death by her parents; husband, Leo; siblings, Leta Beadle and Robert Edminster. Online condolences may be left for the family at


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Graveside Service
March 21, 2020

11:00 AM
Calvary Cemetery, Rock Island
1500 31st Avenue
Rock Island, IL 61201

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