Lisa Robin Kelly was found dead On Wednesday. Lisa, the 'That '70s Show' actress, died in her sleep at a California rehab facility and after Saturday's autopsy, her cause of death is still unknown.  Why Lisa Robin Kelly was found dead will not be known for at least another two months. Kelly was 43 years-old. 

There were no signs of abuse on Lisa Robin Kelly's body when found dead and she was reportedly not on drugs at the time of her death. L.A. County Coroner and L.A. County Sheriff's homicide officers visited Pax Rehab House in Altadena to for information. Police called the death "a mystery." No drugs or alcohol were found in her room.  A coroner's report said there were no drugs in her system.

Lisa Robin Kelly's agent, Craig Wykoff said, "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."

Wyckoff said Kelly was attempting to restart her career. He said "I spoke to her on Monday and she was hopeful and confident and looking forward to putting this part of her life behind her. [On Wednesday] night she lost the battle."

Lisa Robin Kelly played Laurie on "That '70s Show." Laurie was main character Eric Forman's promiscuous older sister. Forman was played by Topher Grace. Lisa Robin Kelly left "That '70s Show" after five seasons and was replaced by Christina Moore. On the show, the characters said she went to beauty school. Kelly said at the time, "With That '70s Show, I was guilty of a drinking problem, and I ran."

Lisa Robin Kelly was born in Southington, Conn. Since "That '70s Show" went off the air in 2006, Lisa Robin Kelly became overwrought with troubles. She was arrested for driving under the influence in North Carolina in Aug. 2010. Lisa Robin Kelly plead guilty and was sentenced to twelve months of unsupervised probation. Lisa Robin Kelly was arrested in Los Angeles in March 2012 after she allegedly beat up an ex-boyfriend. She was charged with corporal injury on a spouse. The Los Angeles DA declined to prosecute. In November 2012, Lisa Robin Kelly and her husband Robert Gilliam were arrested and charged with assault in Mooresville, N.C. She was arrested two months ago and charged with DUI in California.