A drug overdose killed former reality TV star and Playboy playmate Anna Nicole Smith, CNN reported, citing Seminole tribal police Chief Charlie Tiger said Monday.

Tiger said there was no evidence of foul play and the overdose was accidental.

The medical examiner's office had said on March 7 that the cause of Smith's death had been determined, but it would not be announced for one to two weeks to give police time to finish the investigation.

Former Playboy Playmate and oil tycoon's widow Anna Nicole Smith died February 8 after collapsing in her hotel room. She was 39.

She was stricken while staying at the Seminole Hard Rock Hotel and Casino and was rushed to a hospital.

Five months earlier, Smith's 20-year-old son, Daniel, died suddenly in the Bahamas just three days after the birth of her daughter. It was believed to be a drug-related death.

Smith was born Vickie Lynn Hogan and raised in the small Texas town of Mexia, 130km south of Dallas.

She grew up emulating screen legend Marilyn Monroe.

She met elderly oil billionaire J Howard Marshall while dancing at a Houston strip club and married him in 1994, when she was 26 and he was 89.

Marshall died the following year and Smith spent much of the following decade battling members of his family over his estate. In May 2006 the US Supreme Court ruled that Smith could pursue her case in federal court.

Smith, who modelled Guess jeans, was named Playboy magazine's Playmate of the Year in 1993 and had film roles that year in The Hudsucker Proxy and Naked Gun 33 1/3: The Final Insult.

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