- 15 updates
Police guard the Rausing residence in London tonight.
Scotland Yard said the death was being treated as unexplained.
A post-mortem examination began at 1pm today at Westminster Mortuary.
A Scotland Yard spokesman said: "We believe we know the identity of the deceased but await further confirmation."
- Tetra Pak is one of the world's leading companies for food processing and packaging solutions.
- Deliver services to people in more than 170 countries.
- The company has close to 22,000 employees, based in 85 countries.
- Tetra Pak is one of three companies in the Tetra Laval Group – a private group that started in Sweden. The other two companies are DeLaval and Sidel.
Police say a 49-year-old man was initially arrested on suspicion of being in possession of drugs but after the discovery of a woman's body, was further arrested in connection with her death.
A post-mortem examination has taken place this afternoon.
A body, believed to be that of the wife of Tetra Pak heir Hans Rausing, has been found in a flat in Belgravia, London.
Police say they are treating Eva Rausing's death as "unexplained".
Latest ITV News reports
Hans Rausing, heir to the Tetra Pak drinks empire, has been arrested in connection with his wife's death after her body was found.