Actor Brittany Murphy died of pneumonia, a Los Angeles County coroner revealed on Thursday, but prescription drugs also played a role in her death.
Spokesman Craig Harvey said Murphy, who died Dec. 20 at age 32, also had anemia, and multiple prescription drugs in her system.
But those were secondary factors in the young starlet's death, he said. Pneumonia was the primary cause.
Harvey would not say which drugs were involved, but said all traces found were prescription medications.
Murphy, star of Eight Mile and the voice of Luanne on the animated series King of the Hill, collapsed in her Hollywood Hills home after complaining of flu-like symptoms.
She was found by her mother, who moved to California to support her in her acting career. Murphy was married to British screenwriter Simon Monjack, who made the 911 call for help.
Both her mother and her husband have said she did not abuse drugs. In an interview after her death, Monjack said Murphy took prescription medication for seizures and had been taking the over-the-counter drug Robitussin for her flu symptoms.
She also had roles in movies including Clueless, Girl, Interrupted and Don't Say a Word, and episodes of now-defunct TV series Frasier.
A memorial for a foundation in Murphy's name that had been planned for Thursday has been cancelled.