Rosemary K. Kostkas, 87, of Tidioute, PA, died on Monday August 25, 2025, in Kinzua Healthcare and Rehab Center surrounded by her loving family.
She was born in Warren, PA on February 16, 1938, the daughter of the late James P. and Mary S. (Snyder) Kelly. Rosemary was a 1956 graduate of Tidioute High School. She worked for many years as an operator with the Bell Telephone Company. Rosemary also worked for the Tidioute Public Library. She was of the catholic faith and a member of St. John’s Catholic Church in Tidioute, PA. She was a former member of the St. John’s Catholic Church Ladies Guild. She enjoyed growing flowers, gardening, reading, puzzles, and her beloved dogs. Rosemary loved spending time with her close friends of over 40 years. After retirement, she and her husband John enjoyed time traveling to Florida and other destination’s.
On September 26, 1959, in St. John’s Catholic Church, Tidioute, PA, she married John M. Kostkas, and they spent nearly 65 loving years together.
Rosemary is survived by her loving husband, John of Tidioute; son, James P. Kostkas of Warren, PA; grandson, Matthew Kostkas of Warren, PA; and several nieces and nephews.
In addition to her parents, Rosemary was preceded in death by her son, John Kostkas who passed May 29, 2020, her brother, Joseph Kelly, and sister-in-law, Laura Kelly. Rosemary was the last surviving member of her immediate family.
A private graveside service will be held at the convivence of the family in Tidioute Cemetery with the Rev. Joseph J. Kalinowski, pastor of St. John’s Catholic Church, officiating. Those wishing to place memorials may do so through Paws Along the River, 212 Elm St. Warren, PA. E-mail condolences may be sent by visiting www.lewisfuneralhomeinc.com. The Donald E. Lewis Funeral Home Inc. has been entrusted with the funeral arrangements.
Rosie you were the kindest person. I have always said that I couldn’t have hand picked better inlaws than you and Jack. I am going to miss you so much.
Grandma Rosie is how I’ll forever remember you. Your sweetness and kindness to everyone was just a glimpse of how much of a special of a lady you were. You’ll be missed by your family and friends. And by our family. Love, prayers and support to those you left behind. John, Jim and Matthew. If you find yourself missing Rosie be still your mind and listen to her in your heart and the precious memories she has left with you.
I remember Rosemary from my childhood in Tidioute. My mother, Doris Lanning and Rosie’s mother were very good friends. Rosie will definitely be missed.