The troubled actress' death was reported by Ace Showbiz. Kelly's agent Craig Wyckoff said that 'cause of death has not been issued yet and no death certificate has been issued either.'
"Unfortunately Lisa Robin Kelly passed away last evening. 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," he added.
"I spoke to her on Monday and she was hopeful and confident, looking forward to putting this part of her life behind her. Last night she lost the battle. Cause of death has not been issued yet and no death certificate has been issued either," Wyckoff said of the actress. Danny Masterson, who was part on the show as Steven Hyde, mourned the actress' passing on Twitter.
"Terrible, awful news. Brilliant on 70s.... See you next time LRK, kisses," he wrote. Kelly is mostly remembered for her role as the older sister of Topher Grace's character Eric Forman on the hit show. She left the show after five years. The actress started having problem with alcohol following a miscarriage in 2003.
In recent years, Kelly made headlines because of her legal troubles. Last November, Kelly and her husband Robert Joseph Gilliam were arrested after the police received a report of domestic disturbance. She was arrested in June on the suspicion of driving under influence.