Who is Timothy Olyphant's father?

Timothy Olyphant is the spitting image of a fellow I dated in high school, Neal Siat, who lived in Glen Ellyn, Illinois, and went to Glenbard West High School. He graduated in 1965. He was tragically killed in an automobile accident in the spring of 1968 when he was around 21. As Timothy's biography says he was born in May, 1968, Neal could have been is father. I'm not kidding about the likeness. Timothy has many of the same facial expressions, especially his various smiles. When I see him on TV or in the movies I am convinced that I'm looking at Neal's son.