On 29 August 2012, the British journalist Ben Quinn revealed in "The Guardian" that in 2011 Eva Rausing had passed on information to Swedish prosecutors about the unsolved 1986 murder of Swedish prime minister Olof Palme. Scotland Yard had confirmed the day before that it had given information to Swedish authorities, who wanted to question the widower, Hans Kristian Rausing, as a possible witness about the information his wife claimed to have obtained. Gunnar Wall, a Swedish author who has written two books on the Palme killing, said that Rausing had contacted him in June 2011, claiming that she had learned that Palme had been killed by a Swedish businessman, who feared that Palme was a threat to his business. Wall had conducted an e-mail correspondence with Rausing, who told him that she had written to the businessman on three occasions about the allegations. In one e-mail to Wall she wrote: "Don't forget to investigate if I should suddenly die! Just joking, I hope." Wall told the "Guardian": "When her e-mails stopped, I did not think too much about it, until I heard that she had died in circumstances that were unclear ... She also told me that she was going to inform the prosecutors in Sweden and it seemed like she had some arrangement to meet them."