Sandra L. Koeller

Sandra “Sandy” Lee Koeller (Thielke), age 69 of Appleton, WI passed away unexpectedly at Care Partners Assisted Living Home with family by her side on Thursday, June 26, 2025. Sandra was born on July 21, 1955 as the daughter of the late Herman and Evelyn (Danley) Thielke in Clintonville, WI, where she grew up with her siblings and her parents. Clintonville is also where she met her husband, Albert W. Koeller. They came to meet when sandy was getting ready to take a dip in her pool and Albert was living next door. He was outside doing yard work at the time and it was love at first sight. They later married in life and had a family of their own.

Sandy was a fun, loving mother, sister, wife, and grandmother. She always enjoyed doing anything she could to help people and make her family happy. She always enjoyed sitting outside when the weather was nice. She loved spending time with her family any chance she could. She also really enjoyed watching her Westerns.

Sandy will be missed by her siblings, Connie (Ken) Knight and Herman Thielke; her children, Katrina (Jeremy) Dexter, Steve Bessette, James Koeller, Jr. Koeller, and Allen (Stacey) Koeller; her grandchildren, Tiffany (Jonathan) Dorin, Ariel (Sean) White, Jacob (Jessica) Dexter, Isaiah (Madie) Dexter, Isaac (Jess) Dexter, Faith (Jeremy) White, JJ Gabe, Hope, Chastity, Destiny, Brittany, Skylar (Kimberly), Brian (Aurora) Oliver, Ethan (Evan), Alexie (Jaydin), Rowin (Ryan), Luca (Analiese), Schmitty, and Ernie; as well as many other nieces, nephews, other extended relatives, and dear friends. A special thanks to Holly, her caregiver for the past few years. Thank you for making her feel special and going above and beyond caregiver.

Sandy is preceded in death by her husband, Albert Koeller; her parents, Evelyn and Herman Thielke; and her siblings, Robert “Bob” Thielke and Zion White.

A private family viewing was held at Wichmann Funeral Home on Sunday, June 30, 2025. In respect with Sandy’s wishes, no formal funeral services will be held.