Hans and Eva Rausing 'tried and tried' to beat drug problem She later met Rausing at Farm Place, a £2000-a-week rehab centre near London that was once described as Britain's answer to the Betty Ford rehab clinic founded by the former First Lady of America. Describing the early stages of their marriage, Mrs Kemeny said: "In the beginning years [she was] very much a positive influence, and give her the credit for getting him off drugs and getting him well." They were a "golden couple" and became friends with Prince Charles, receiving letters from him thanking them for their work. The pair donated millions to various charities including organisations that supported drug users. Mrs Rausing was a patron of the drug and alcohol charity Mentor. They appeared to have defeated their demons and had been clean for their first 12 years as a wedded couple. Rausing was said to have felt dominated by his father an that he could not be good enough. Mrs Kemeny, speaking from her home in South Carolina, said: "Hans was clean of drugs when they got married and they remained clean for the first 11 or 12 years of the marriage." But a relapse saw Rausing suffer a greater struggle with his drug problem than his wife. The mother-of-four had sought help at a clinic in California in March but was so concerned by her lack of contact with her husband, she returned to their £70 million five-storey home in Chelsea. "He wouldn't answer her emails and texts and she got very afraid and she came back and helped to get his passport so he could go back with her," her mother said. From then on we don't know what went wrong. Asked how she was coping Mrs Kemeny said: "I have 10 grandchildren. For them I have to hold up not crash. Mrs Rausing's family has been told her death may have been linked to a pacemaker fitted in around 2005, which went "really high." The inquest was told a post-mortem examination had failed to establish the cause of death and results of toxicology tests were pending. Police are also investigating when the mother-of-four may have died after it was suggested her husband lived in the house with his wife's body for several days because he "could not bear" the idea of her death. He was represented at Westminster Coroner's Court by Neil Saunders QC, who acted for 10 families at the inquest into the 7/7 bombings. DI Sharon Marman told coroner Dr Shirley Radcliffe that Rausing was stopped in his car while driving in Wandsworth, south London. "He has been arrested on suspicion of her murder and we await notification of when he will be fit to be interviewed," she said. Mrs Rausing's family are said to "love him very much" and do not blame him for her death. Mrs Kemeny added: "When you start taking drugs you can't blame someone else. You take these drugs yourself and you can say no. They tried to get themselves better, they tried and tried and tried. Every time she went to a clinic she felt sick about leaving him. The inquest was adjourned and will be reviewed in private on October 5.