Former model Anna Nicole Smith died of an accidental overdose from a combination of prescription drugs, Florida authorities said at a press conference Monday.

Anna Nicole Smith was taking a host of prescription drugs when she died, according to a Florida medical examiner.
(Manuel Balce Ceneta/Associated Press)

After a thorough investigation, which included combing through hours of video and two laptop computers found on the scene, police found "nothing unusual" and "no evidence of illegal drugs," said Seminole Police Chief Charlie Tiger.

"There was nothing to indicate foul play."

Broward County Medical Examiner Joshua Perper, who led Smith's autopsy, said the former Playboy Playmate died of "combined drug intoxication" with the sedative chloral hydrate as the major factor.

During the investigation, Perper and his team discovered through the evidence at the scene and from interviews that Smith had been taking a host of medications, including anti-anxiety and anti-depression medication, growth hormone and vitamin B injections, and methadone, for pain.

She had also been prescribed Tamiflu and an antibiotic after complaining of having the flu, Perper said.

Smith, 39, arrived at the Hard Rock Hotel and Casino on the Seminole native reserve in Hollywood, Fla., on Feb. 5 but was seldom seen because she was said to be ill.

On Feb. 8, she was rushed to hospital after being discovered unresponsive in her room. Smith was later pronounced dead at hospital.

Over the past six weeks, Perper said he and his team have conducted a "large number of tests" to try to pinpoint the cause of Smith's death after finding no evidence of disease during a detailed autopsy. He said he also consulted with six outside forensics experts.

A media storm has erupted since the eccentric Smith died about six weeks ago.

Anna Nicole Smith's former boyfriend Larry Birkhead, left, reacts after the March 2 funeral service in Nassau for Smith. His lawyer, Debra Opri, comforts Smith's companion, Howard K. Stern.
(J. Pat Carter/Associated Press)

Aside from the mystery surrounding her death, there were legal battles between her companion Howard K. Stern, a former boyfriend and Smith's mother involving custody of the former model's body and where she was to be buried.

Also, Stern, former boyfriend Larry Birkhead and another man have all claimed to be the father of Smith's baby, Dannielynn.

A former exotic dancer, Smith rose to fame as a Playboy Playmate and sometime fashion model in the mid-1990s. She was also known for her May-December marriage to 89-year-old oil tycoon J. Howard Marshall II, who died the year after they married.

For the past decade, Smith has been fighting Marshall's family for her share of his estimated $500 million US fortune — an ongoing legal battle which could one day make her infant daughter very wealthy.

Just three days after Smith gave birth to her daughter in the Bahamas last September, her 20-year-old son Daniel died mysteriously. A private pathologist concluded that he died from a lethal combination of methadone and two antidepressants. An official inquiry into his death is scheduled to begin in the Bahamas Tuesday.

With files from the Associated Press.