The Swedish author, who penned the Millennium trilogy of novels including hit book The Girl with the Dragon Tattoo, was fascinated by the 1986 killing and spent almost a year investigating the case with his partner Eva Gabrielsson.
Larsson later gave police the name of a man he suspected of involvement in the shooting, but although the suspect was spoken to by officers, he was never formally charged.
Details of Larsson's probe emerged in 15 boxes of material on the killing which was collected by the author prior to his death in 2004.
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