Eva Rausing, wife of Tetra-Pak cartons billionaire Hans Kristian Rausing, has been found dead in west London.
Eva Rausing’s body was reportedly found at Cadogan Place, Belgravia.
The death is being treated as unexplained.
Hans Kristian Rausing, 49, one of Britain’s richest men, has been arrested over the death of his wife after she was found dead from a suspected drug overdose.
He was tonight being questioned by Scotland Yard detectives after the body of his American wife Eva, 48, was found at their home.
He is currently in custody at a south London police station.
A post-mortem examination of Eva Rausing’s body began at 13:00 BST at Westminster Mortuary.
Police said they searched the address and found the body after making the drugs arrest on Monday.
Officers could be seen guarding the front door of the Cadogan Place home, which was taped off.
The large terraced house is in one of London’s most expensive areas just off Sloane Street, between Knightsbridge and Chelsea.
In 2008 Eva Rausing and her husband faced drug charges after crack, heroin and 52 g of cocaine were found in their home.
Eva Rausing had been arrested after she allegedly tried to smuggle small amounts of crack cocaine and heroin into the US embassy in London.
Charges were then dropped and a caution issued instead.
In 2010 Forbes ranked Hans Kristina Rausing’s father, Hans Rausing Senior, 86, as the 64th richest man in the world, worth an estimated $10 billion.
The family made their fortune from the Tetra Laval milk carton, patented by Ruben Rausing in the 1960s.
It allows milk to be kept fresh without refrigeration.