Lisa Robin Kelly, the actress best known as the promiscious older sister of Eric Forman on "That 70's Show", has died in her sleep at a California treatment facility.  She was 43.

Lisa had been arrested 4 times in the last 3 years for DUI, assult and spousal abuse. She has battled substance abuse problems and, according to her agent Craig Wyckoff, had said Monday she was "looking forward to putting this part of her life behind her."

TMZ has reported her cause of death as cardiac arrest.

Photos: Lisa Robin Kelly

Photo Credit: Everett Collection