Leslie graduated from Herreid High School in 1946 and graduated from South Dakota State University in 1951. He moved to Seattle and began a 40-year career as an engineer with Boeing.
Les married Viola Goodale on June 14, 1954. He was a long-time member of Magnolia Presbyterian Church.
He is preceded in death by his parents, Konrad and Ella Deibert; wife Viola Deibert; sons Timothy Deibert and Alan Deibert; grandson Robert Deibert and sister Arlene Walls.
He is survived by daughter Sharon Nighswonger (Dave) and son Steven Deibert (Jeanne) and five grandchildren, Dana and Samantha Nighswonger; Steven, Adele, and Ze Hua Deibert; sisters Maxine Knittel, Lyla Jesser, and brother Jerry Deibert (Violet); as well as many nieces and nephews.
A celebration of life will be held on January 20, 2019, at Magnolia Presbyterian Church, 3:00 PM.
Memorials may be sent to Magnolia Presbyterian Church Memorial Fund, 3051 28th Ave. W., Seattle, 98199.