Frank Rodriguez, a long time friend of Anna Nicole Smith, told ET that Anna confided in him back in 1998 that she suffered from the painful disease Lupus. Frank said Anna swore him to secrecy but he decided to come forward because he doesn’t want people remembering his friend as a drug addict.

Lupus is a terrible disease in which the body’s immune system attacks its own organs and tissues causing pain in the joints, fever, prolonged fatigue and seizures. Frank says Anna would just ’shut down’ and sleep for days at a time and he fully believes her disease was the cause of her death.

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