Lisa Robin Kelly, who played Eric’s older sister Laurie on That ’70s Show, was found dead last night at a rehab facility she had checked herself into. The 43-year-old’s years since her star turn have been extremely troubled—she struggled with drug and alcohol addiction, and had been accused of several counts of domestic assault. Reports say she had recently filed for divorce from her 61-year-old husband and was intending to turn her life around. “She had been fighting demons for a while,” her agent told TMZ. “And finally lost her battle” …