A source in the L.A. County Corner's office told TMZ that Lisa Robin Kelly's death has been ruled an "accidental overdose," resulting from "multiple drug intoxication."
Days before her death, Kelly had blown an often fatal .34 blood alcohol level, which led her to the L.A. county rehab facility where she died.
Kelly was best known for her portrayal of Eric's older sister Laurie Forman on That 70s Show.
At present, there is no information about what drugs were in her system. The full coroner's report will be released in 2 weeks.
You can read more about the actress, and her tragic death here: