In emails to Gunnar Wall, an author and expert in the Palme investigation, Mrs Rausing, married to Tetra Pak heir Hans Kristian Rausing, said she knew who killed the Swedish PM and feared for her life, writes Swedish newspaper Dagens Nyheter.

The first email to the Swedish author, who has written two books about the murder outside a cinema in Stockholm, was sent in June last year with the subject “I know who killed Palme”.

She wrote: “My name is Eva Rausing and I am married to Hans K Rausing and I have recently found out from my man, who I have been married to for 20 years, that XX was behind the murder of Olof Palme. My husband found this out by a coincidence many years ago and it affected him really, really badly. I think I know where the murder weapon is.”

Mrs Rausing wrote that a Swedish businessman was behind the murder, claiming he “thought Palme was a threat against his company and didn’t want to lose it.”

Mr Wall told Dagens Nyheter that Olof Palme, an opponent of the Vietnam war and a supporter of the South African anti-apartheid struggle, had many strong enemies in the Swedish business community.

In a later email Mrs Rausing, who was a drug addict just like her Swedish husband, wrote: “I am scared of XX. He is not a good person but I would never tell something like this if it wasn’t true.”

In another one she wrote: “Don’t forget to investigate if I should suddenly die! Just joking, I hope.”

Mr Wall had questioned if it really was Mrs Rausing and wondered what would make her information more valuable than the many random tips people still come to the investigation group 26 years after the killing.

He told the Guardian: “When her emails stopped, I did not think too much about it, until I heard that she had died in circumstances that were unclear.”

During the largest murder investigation in Swedish history 130 people have taken responsibility for the killing.

Varg Gyllander, press secretary at the Swedish National Bureau of Investigation, told Aftonbladet, another Swedish newspaper: “We are aware of these facts and there has been a meeting between the Palme group and prosecutors.

“All tips we get are dealt with. But the Palme killing is not solved yet.”

The email correspondence that the Swedish newspaper got to read was handed to Swedish investigators on Tuesday.

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