Lisa Robin Kelly's Cause of Death Remains Unknown

08/18/2013 at 12:50 PM EDT

Lisa Robin Kelly Dead: Cause of Death Unknown
Lisa Robin Kelly
Everett Collection
An autopsy on Lisa Robin Kelly was completed Saturday, but the cause of her death will not be known for at least another two months.

It will take that long for toxicology results to come back from the lab for the That '70s Show star, a coroner's office spokeswoman tells CNN.

Kelly died in her sleep Wednesday night after voluntarily checking herself into a treatment facility earlier in the week to confront "the addiction problems that have plagued her these past few years," her agent, Craig Wyckoff, told PEOPLE on Thursday.

"I spoke to her on Monday, and she was hopeful and confident, looking forward to putting this part of her life behind her," he added.

According to TMZ, the actress, who made her TV debut on Married... with Children in 1992, had been arrested at least four times over the past three years for DUI, spousal abuse and assault.

Your Reaction

Follow Us

On Newsstands Now

Lupita Nyong'o: Most Beautiful!
  • Lupita Nyong'o: Most Beautiful!
  • Chelsea Clinton is Pregnant!
  • Exclusive Royal Tour Diary

Pick up your copy on newsstands

Click here for instant access to the Digital Magazine

blog comments powered by Disqus

From Our Partners

Watch It

Editors' Picks

From Our Partners

Sign up for our daily newsletter and other special offers.
    Choose your newsletters
Thank you for signing up! Your request may take up to one week to be processed.
    see all newsletters