Anna Nicole Smith's former boyfriend and two doctors have been charged with conspiracy to furnish drugs to the former Playboy playmate before she died of an overdose in 2007.
Prosecutors say Smith's former boyfriend and lawyer, Howard K Stern, and doctors Sandeep Kapoor and Khristine Eroshevich were charged on Thursday with three felony counts of conspiracy in Los Angeles Superior Court.
Los Angeles County District Attorney spokeswoman Sandi Gibbons says the three were also charged with other felonies including obtaining fraudulent prescriptions and unlawfully prescribing a controlled substance between June 2004 and January 2007, just two weeks before Smith's death.
"These individuals repeatedly and excessively furnished thousands of prescription pills to Anna Nicole Smith, often for no legitimate medical purpose," California Attorney General Edmund G. Brown said in a statement.
The attorney general's office said later that Stern and Kapoor were released on Thursday night after each posted a $US20,000 ($A30,557) bond.
Eroshevich, a Los Angeles psychiatrist and friend of the starlet's, is alleged to have authorised all the prescription medications found in the Hollywood hotel room where Smith, 39, was found unconscious shortly before her death.
Eroshevich's lawyer, Adam Braun, has admitted his client wrote some of the prescriptions using fictitious names for Smith but said he never intended to commit fraud.
"It was not to deceive anyone. It was done for privacy reasons," Braun told the Associated Press.
"She did the best she could under difficult circumstances in the best interest of the patient."