Leonard J. Kislavage Sr., 84, of Nanticoke and formerly Sweet Valley, passed away peacefully Sunday, February 23, 2020 at his home. Born February 4, 1936 in Wanamie he was a son of the late Adam and Rose Pilachauskas Kislavage an lived his early life in Newport Township. He worked in the mines for one day then moved to New Jersey where he began employment with General Electric until he was drafted in to the military. He served with the U.S. Army during the Korean War and while in the service learned his trade in construction. He was a self- employed contractor in the area for many years. Among the many projects he did, he was proud to have built the altar at his family’s church, St. Mary’s in Wanamie. He belonged to many organizations over the years including the American Legion and VFW. He was a champion at darts, travelled the country competing and was inducted into the National Darts Hall of Fame. Leonard was preceded in death by his first wife, Rita in 1979, second wife, Jean Kamus Kislavage in 2012; a son, Leonard Jr. in 2017; sisters, Loretta Serapilia and Mary in infancy and a brother, Joseph Kistler. Surviving is his daughter, Susan Maslar, who is honored and thankful to have him as a father; grandchildren, Justin Baloh, Eva Maslar, David Maslar and fiancé, Brooke Warakomski, Chelsea Maslar and fiancée, Anthony Ranieli and Jacob Maslar; several great grandchildren; a sister, Eleanor Pepe; a brother, Albert Kislavage and nieces and nephews. A private gathering will be held at Davis-Dinelli Funeral Home, Nanticoke. Interment will be in St. Ann’s Cemetery, Lehman. There will be no public calling hours.