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Gunnar Björk (Not "Bjorck") is a character in The Girl Who Played with Fire.

He's a member of SAPO and is the lead source against Alexander Zalachenko for Mikael Blomkvist. Blomkvist blackmailed him into giving up information, in return for keeping the secret of him using illegal prostitutes. However, early in The Girl Who Kicked the Hornets' Nest, Gunnar was murdered by The Section and his death made to look like suicide.