Socialite's death still unexplained

Eva Rausing, 48, was found in an advanced state of decomposition more than a week ago in the London mansion she shared with her husband, Hans Kristian Rausing, the son of one of the world’s richest men.

Rausing had a troubled past. In 2008 she attempted to smuggle crack cocaine into the American embassy in London, and her problems with drugs didn’t end there.

“She had been introduced to drugs at an early age,” Liz Brewer, a friend of Rausing, tells CNN’s Nima Elbagir. “But she got married. She seemed to be very happy.”

Watch the video above for rare footage of Rausing with her husband in London. Filmed in May, it is the last time she was seen alive.

Rausing met her husband in a drug rehab facility more than 21 years ago. “When I met him – he wasn’t reclusive, he was far more difficult to talk to,” Brewer says.

While sobriety remained a constant struggle in Rausing’s life, she focused her attention and wealth on an addiction prevention charity. “She gave a great deal of money to us over the years,” says Eric Carlin, the founder of Mentor UK.