It is with great sorrow that we announce the sudden passing of a dear husband, father, son, brother, and uncle, William Kostyniuk, at the age of 54 years who passed away in his home in Grade Prairie, Alberta on July 4, 2018. William was born on September 27, 1963 in Cudworth, Saskatchewan to Hilda and William (Sr) Kostyniuk. He was raised in Wakaw and attended school there. One of his first jobs was in the Produce Department at the Wakaw Co-op. On August 10, 1985, he married Teresa Klack, to this union they had two wonderful sons, Brennan William Alexander Kostyniuk, and Brent Nicholas Kostyniuk. William and Teresa moved to Grande Prairie in 1988 and he resided and worked as a pipefitter until his untimely passing. William is survived by his wife, Teresa, his sons, Brennan Kostyniuk, Brent Kostyniuk, his mother Hilda Kostyniuk, his brother Robert (Donna) Kostyniuk, his sisters: Rosemarie St. Germaine, Susan (Gerry) Clark, Kathy (Kim) Thorpe; as well as numerous nieces, nephews, cousins and their families. He was predeceased by his father, William (Sr) Kostyniuk, brother, Michael Kostyniuk, brother-in-law, Ray St. Germaine, father-in-law and mother-in-law, Alex and Sylvia Klack.