Lisa Robin Kelly, who played Eric Foreman's (Topher Grace) promiscuous older sister on the Fox sitcom "That '70s Show" before entering a spiral of alcohol-related arrests, died in her sleep Wednesday at a rehabilitation facility. She was 43.

"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," her agent, Craig Wyckoff, said in a statement 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 said no cause of death had yet been determined.

Kelly was born in March 1970 and raised in Southington, Conn., according to the Hartford Courant. She made her screen debut in a 1992 episode of the Fox sitcom "Married . . . with Children," and went on to appear in numerous other shows and a handful of movies.

She appeared in 50 episodes of the 1998-2006 series "That '70s Show," in seasons one, two and three before her character left for beauty school. She returned in season five, but was replaced by actress Christina Moore for season six.

Kelly told ABC News last year that her life had become sidetracked after she lost a baby.

She pleaded guilty in North Carolina in November 2010 to driving while intoxicated. In spring 2012, Los Angeles police charged her after an ex-boyfriend claimed she had hit him, an allegation Kelly denied. Prosecutors dropped the charges. That November, she and husband Robert Joseph Gilliam, 61, were arrested following a disturbance at their home in Mooresville, N.C. They later filed for divorce.

Kelly was arrested in Southern California on June 23 on a drunken-driving charge.

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