John D. Marquis, 78, of Slippery Rock, passed away on July 7, 2023. He was born on December 30, 1944, in Berks County, Pennsylvania. After graduating from High School, he joined the United States Air Force then moved back to Pittsburgh and worked at US Steel, then as a computer programmer later in life. John was a devoted Jehovah’s Witness most of his life. He enjoyed riding roller coasters, hiking, tennis, riding bikes, and mostly spending quality time with his wife. John is survived by his wife of 45 years, the love of his life, Patricia Marquis, his stepson and step-daughter-in-law Gene and Peggy Stiles and step- granddaughter Emma Stiles. He is also survived by his daughter and Son- in-law Stephanie and David Crain Sr. and daughter Jennifer Marquis, as well as his 8 grandchildren and 7 great grandchildren. He is also survived by one brother Richard “Gus” Marquis. John was preceded in death by his parents William and Irene Marquis, and his brothers Louis Marquis and William “Bill” Marquis. There will be no services according to John’s wishes. Arrangements through SPENCER D. GEIBEL FUNERAL HOME & CREMATION SERVICES, 140 NEW CASTLE RD. BUTLER, PA 16001, WWW.SPENCERDGEIBEL.COM