Lisa Robin Kelly

Actress Lisa Robin Kelly, shown after her arrest for assault, died last week at a Los Angeles addiction treatment facility she had entered a few days before. (Associated Press / November 29, 2012)

L.A. County Sheriff's homicide investigators have ruled out foul play in the death of actress Lisa Robin Kelly, who was found dead at rehab facility last week after checking into the location two days before.

Sheriff's homicide detectives have conducted an initial investigation into Kelly's death and at this point have found it involved "no foul play," said Steve Whitmore, a sheriff's spokesman. Kelly is best known for her role in "That '70s Show."

The coroner's reports into Kelly's death is still under seal and no cause of death has been made public.

The 43-year-old actress' agent Craig Wyckoff said after her death that Kelly had been dealing with her troubles with addiction, and had voluntarily checked into a California rehab facility on Monday, Aug. 12. She apparently died in her sleep sometime last Wednesday night.

"I spoke to her on Monday and she was hopeful and confident, looking forward to putting this part of her life behind her," Wyckoff said in a statement. "Last night she lost the battle."

Kelly had several run-ins with law enforcement, most recently an arrest in June on suspicion of driving under the influence after her car stalled on the 5 Freeway in Burbank.

Kelly and her husband, Robert Joseph Gilliam, were also arrested last November after police were called to their home in Mooresville, N.C., after a report of a domestic disturbance.

In June of this year following the DUI, Kelly filed for divorce from her husband.

Kelly acknowledged she began drinking heavily in 2003, following a miscarriage. The drinking eventually led to her departure from the series. She told ABC News in 2012: "I had lost a baby. As a result of that, I lost everything and I was abusing alcohol."

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richard.winton@latimes.com