William Jeffrey Koster, 72 of Middletown, passed away Wednesday, July 27, 2016 Hospice of Butler and Warren Counties. He was born March 12, 1944 in Fond Du Lac, Wisconsin, the son of the late William and Marquerite Koster. William is survived by his wife of 30 years, Debra (Grass) Koster; a daughter, Danielle (husband, Andy) Ward; two sons, Jason W. (wife, Michelle) Koster and Sean Koster; eight grandchildren; three great grandchildren; and his brother, Brian (wife, Lantha) Koster. Services will be private at the convenience of the family. Please visit www.breitenbach-anderson.com to leave a memory or condolence.