Eva Rausing's Death: Heiress's Husband Not Fit for Police Questioning

Alan Davidson/WireImage(LONDON) -- Hans Rausing, the billionaire heir who was arrested in connection with his American wife's death, is receiving treatment for drug and alcohol withdrawal, and has yet to be questioned by police, according to today's inquest into her death.

The death of his wife, Eva Rausing, 48, whose body was found in the couple's London home, is still being investigated as an "unexplained death," even though Rausing has been arrested on suspicion of his wife's murder, a Metropolitan Police spokesperson told ABC News. No charges have been filed.

On Monday, Hans Kristian Rausing was arrested for driving erratically. Upon searching his car, police found drugs, which prompted them to search the home he shared with his wife in the London's Belgravia neighborhood, according to a police spokesperson.

Officers found the lifeless body of Eva Rausing in an upstairs bedroom at their home. The heiress, who was a friend of Prince Charles, may have been dead for more than a week, according to reports.

A postmortem held Tuesday at Westminster Mortuary was inconclusive. Authorities said they were waiting on toxicology results to determine if the heiress, who had a history of drug addiction, had died of an overdose.

Hans Rausing, who is Swedish, is an heir to the Tetra Pak food packaging empire. His father, Hans Rausing Sr., has an estimated net worth of $10 billion, according to Forbes' 2010 rankings.

Eva Rausing was the daughter of Tom Kemeny, a former Pepsi executive.

Together, Hans and Eva Rausing were well-known as a billionaire power couple who donated generously to addiction-related charities but also secretly battled the same demons that brought them together 25 years ago in an American rehab clinic, where they first met.

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