Tore Hedin (7 January 1927 – 22 August 1952) was a Swedish mass murderer and police officer. The act perpetrated by Hedin, commonly known as Hurvamorden, is infamous for being the worst known act of spree killing in Swedish criminal history, and for the fact that Hedin, as a police officer, had been assigned to investigate his own first murder for an extended period. Hedin also employed a medium, itself unique for a Swedish homicide investigation. . First crimes. Tore Hedin was born in Stora Harrie, Scania, near Kävlinge.
https://en.wikipedia.org/wiki/Tore_Hedin