Eva Rausing, one of Britain's richest women, was found dead in London's Belgravia neighborhood, BBC News reported.
Scotland Yard found a body at an address in Cadogan Place, Chelsea on Monday, the Independent reported, and have arrested a 49-year-old man on suspicion of possession of drugs in connection to Rausing's death.
Police have not yet confirmed the identity of the body or the suspect, but told reporters they are treating the death as "unexplained," Sky News reported.
According to the Telegraph, the man in custody is believed to be Rausing's husband, Hans Kristian Rausing, who is the heir to his father's packing company Tetra Pak's £5.4billion fortune.
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The younger Hans (his father goes by the same name) had a reputation as a "wild child" and spent several years in his 20s living in India and shunning his family's wealth, according to the Daily Mail.
He has no current involvement in the Tetra Pak business, and it is unconfirmed if he has another job, the Daily Mail reported.
Mr. and Mrs. Rausing faced drug charges back in 2008, when crack, heroin and cocaine were found in their home in London's posh Cadogan Terrace neighborhood, BBC News reported.
The couple, who have four children, met at an addiction clinic in the US, the Telegraph reported.
Eva Rausing is the daughter of millionaire American businessman Tom Kemeny, The Daily Mail reported. Kemeny, a former Pepsi executive, owns an island off South Carolina.