Our beloved brother, uncle, and cousin, Dean Greenwalt, lost his life Saturday September 26, 2009 when he was struck by a hit and run driver in a crosswalk near his home in Woodland Hills, California. Dean was born July 8, 1943 in Rapid City, SD to Gerald and Eva Greenwalt. He was raised on the family farm located near Owanka, SD. He was very interested in genealogy and proud that the farm was where his mother was also raised; having been purchased by his maternal grandfather in 1918. He graduated from New Underwood High School in 1960 and from South Dakota School of Mines and Technology in 1964 with a degree in Electrical Engineering. During college he was in the Reserve Officer Training Corps. After graduation he worked for McDonnell Douglas Aircraft in St. Louis. Dean joined the Army and was stationed in Germany for two years as a 2nd Lieutenant. After his discharge he was employed by Hughes Aircraft Co. in Los Angeles in the aerospace industry where he worked on aircraft and missile guidance systems. His projects included the Patriot and Cruise missile systems. Dean retired at age 55 to pursue his many interests. He will be greatly missed by his family, friends and neighbors. Dean was a kind, honest, and gentle man who always had time to lend a helping hand. His engaging smile, intellect and love of good conversation were some of his most endearing qualities. Dean lived in a quiet, comfortable and close knit neighborhood. His neighbors reflected that Dean was the heart of the neighborhood and that his spirit will live on forever here. In addition to his many friends and wonderful neighbors, he is survived by his brother Craig Greenwalt (Susie), and his sister Carol Rickert (Joe). He is also survived by cousins, numerous nieces, nephews and several great nieces and nephews. He was preceded in death by his parents and twin sister, Deanne Dorsey. A private family service was held in Woodland Hills. A celebration of Deans life with his many friends and neighbors is pending in California.