Hedström works at Milton Security and is assigned to the team investigating the murders of Dag, Mia, and Bjurman. He wanted to be a policeman, but a heart problem kept him of the force. He's very bitter about this. He also hates Salander because she caught him acting unethically on a case and threatened to turn him in. Hedström sabotages the police investigation by leaking scandalous details about Salander to reporter Tony Scala, until, that it, Detective Bublanski catches him.