Ten-year-old Helén Nilsson was the victim in a sadistic murder case (Swedish: Helénmordet) in Hörby, Sweden, in March 1989. The murderer, Ulf Olsson, the so-called Helén man (Swedish: Helénmannen), was convicted in April 2005, having been found after a DNA test in 2004. Nilsson was abducted on the evening of 20 March 1989. She had decided to meet with two friends outside a grocery store, but they never met. She was found murdered six days later in the woods about 20 kilometres outside Hörby. Police discovered that Nilsson had been alive for a couple of days after the abduction.
https://en.wikipedia.org/wiki/Murder_of_Hel%C3%A9n_Nilsson