KOSTEK – Janice (Arndt) July 26, 1953 – August 11, 2025 of Cowlesville, NY.  Beloved wife of Jim Kostek; loving mother of Martin (Heather) Kostek and Jennifer (Joe) Calkins; dearest Nana of Lucas and Isla; sister of Paul (Deborah) Arndt; sister-in-law of Sharon (Tim Pfalzer) Kostek and Tom (Elaine) Kostek; also survived by loving cousins, nieces and nephews.  Funeral service will be held privately with the family.  Donations may be made in Janice's name to St. Jude's Children's Hospital or the Roswell Park Alliance Foundation.  Share condolences at wendelandloecherinc.com