Jan Egon Staaf (born 11 January 1962 in Västerås) is a Swedish police commissioner and former track and field athlete who competed in walking. He twice competed for his country at the Summer Olympics: in 1988 and 1996. Staaf set his personal best (1:22.37) in the men's 20 km walk event in 1997. Jan Staaf joined the police force in 1998 after his retirement from the sport. He was serving as head of investigation in serious crimes when got involved in the double murder case in Linköping in 2004. He led the investigation which was solved with the help of DNA genealogy.
https://en.wikipedia.org/wiki/Jan_Staaf