One of Britain's richest women, Eva Rausing, has been found dead at her London home, according to Sky sources.
A 49-year-old man has been arrested in connection with her death and is in custody at a south London police station.
Police have not yet confirmed the identity of the body but said they are treating the death as "unexplained".
In a statement, the Met Police said: "Yesterday (Monday) a 49-year-old man was arrested on suspicion of possession of drugs.
"Following a subsequent search of an address in Cadogan Place in SW1 a body was found.
"The death is being treated as unexplained and a post mortem commenced at 1pm today at Westminster mortuary.
"We believe we know the identity of the deceased but we are awaiting confirmation.
"The 49-year-old man was further arrested in connection with the death and is in custody."