Authorities have recovered four prescription drug bottles bearing the name of actor Cory Haim but found nothing illegal while investigating his death, officials said.
Assistant chief coroner Ed Winter declined to identify the drugs. Haim was battling flu-like symptoms in the days before his death.
Mr Winter says an autopsy was completed on Thursday, but his office is awaiting the results of toxicology tests which could take two months before determining a cause of death.
Haim died on Wednesday in Burbank, Los Angeles, after collapsing at his mother's apartment. The 38-year-old former child star had battled drug addiction for years.
He earned fame for roles in the 1980s films Lucas and The Lost Boys. He had recently completed several film projects.