One of Britain's richest men is receiving medical treatment after he was arrested on alleged drugs offences by police who then discovered his wife's body.
Hans Kristian Rausing, the heir to the Tetra Pak drinks carton empire, is being held after the body of his spouse Eva was found at the couple's London home in Cadogan Place, Chelsea.
Mr Rausing, who stands to inherit a billion-pound fortune from his father's business, was taken into custody at a south London police station but has since been moved to a "medical facility", police said.
Scotland Yard would not confirm the name of the suspect, but said a 49-year-old man was arrested in south London on Monday morning on suspicion of possession of drugs. Later that afternoon, officers conducted a search at an address in Cadogan Place where they discovered Mrs Rausing's body.
The man was further arrested in connection with the mother-of-four's death. His bail has been suspended while he receives medical treatment, the force said.
Police are treating the death of Mrs Rausing as "unexplained" and a post-mortem examination held on Tuesday failed to establish a formal cause of death. Investigators said they are awaiting the results of further tests in the hope they will shed some light on the death riddle.
A Metropolitan Police spokesman said: "Officers from the Homicide and Serious Crime Command are investigating, and the death continues to be treated at this time as unexplained."
Grieving relatives of the married couple, whose past drug problems have been widely reported, on Tuesday night revealed their sorrow over the death. A statement from the family of Mrs Rausing, whose maiden name was Kemeny, said: "Tom and Nancy Kemeny along with all of their family are deeply saddened by the death of their beloved daughter, Eva Louise Rausing.
"Eva was a devoted wife for 20 years and mother of four much-loved and wonderful children. During her short lifetime she made a huge philanthropic impact, supporting a large number of charitable causes, not only financially, but using her own personal experiences. She bravely fought her health issues for many years. The family is devastated at her death and asks to be given privacy at this difficult time."
The Rausing family said they were "deeply shocked and saddened to hear of the tragic death of their daughter-in-law" and also asked for their privacy to be respected. Mr Rausing stands to inherit the £5.4 billion business enterprise built by his Swedish father, also named Hans.