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OTRC: Lisa Robin Kelly dies: Former 'That '70s Show' actress was 43

Lisa Robin Kelly appears in a scene from the FOX show 'That '70s Show.' (Carsey-Werner-Mandabach Productions / FOX)

Lisa Robin Kelly, who starred on "That '70s Show," has died at age 43.

She passed away in her sleep on Wednesday evening -- not long after she had begun treatment at a rehab facility in California, her agent told OTRC.com on Thursday, Aug. 15. The cause of her death was not revealed.

"Unfortunately Lisa Robin Kelly passed away last evening. Lisa had voluntarily checked herself into a treatment facility early this week where she was battling the addiction problems that have plagued her these past few years," he said. "I spoke to her on Monday and she was hopeful and confident, looking forward to putting this part of her life behind her. Last night she lost the battle."

Kelly played Laurie Forman, Topher Grace's character's taunting sister on "That '70s Show" between 1998 and 2003. She has over the past year and a half made headlines due to legal turmoil -- she was detained for allegedly driving under the influence of alcohol in June and was arrested for alleged spousal assault twice in 2012. Kelly filed for divorce from her husband in July.

In April, following one of the latter two arrests, she appeared on the ABC series "Good Morning America" and spoke about her first spousal assault arrest tearfully. She denied being under the influence of any substances.

When asked if she was on drugs at the time her mug shot was taken, she said: "Absolutely not. There is nothing that I was on or abusing at that time."

Kelly was also arrested on suspicion of drunken driving in North Carolina in 2010 and pleaded guilty. She was sentenced to 12 months of unsupervised probation.

(Pictured above: Lisa Robin Kelly appears in a scene from the FOX show "That '70s Show.")

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