The autopsy for That ’70s Show actress Lisa Robin Kelly was completed Saturday, but we might not know her cause of death for two months, a Los Angeles Coroner’s Office spokeswoman told CNN.

Last week, the actress voluntarily admitted herself to a treatment facility, where she died late Wednesday night. Toxicology results could take eight to 10 weeks to return from the lab.

“I spoke to her on Monday and she was hopeful and confident, looking forward to putting this part of her life behind her,” Kelly’s agent, Craig Wyckoff, said in an email to EW last week. “Last night she lost the battle.”