Actress Christina Moore took over the role of Laurie Forman from Lisa Robin Kelly during That '70s Show season 6 and many still wonder why. The That '70s Show Laurie character was the older sister of Eric (Topher Grace) and the daughter of Red (Kurtwood Smith) and Kitty (Debra Jo Rupp). Laurie came off as extremely manipulative, and her parents didn't have the highest expectations of their daughter, but it was clear she was Red's favorite. Kelso (Ashton Kutcher) was one of Laurie's many secret flings, despite Kelso dating Jackie (Mila Kunis).

But although she was involved in many plot points, in the middle of That '70s Show season 3, Laurie seemingly disappeared.

Laurie actor Lisa Robin Kelly was then written out of That '70s Show cast when her character went off to beauty school. Thanks to her time on the sitcom, Kelly was getting more roles such as Charmed, Jawbreaker, and Clubland. But why Laurie was recast has a more tragic backstory.

Laurie Was Recast Due To Lisa Robin Kelly's Personal Struggles

Lisa Robin Kelly was set to return for the following season, but sadly, she suffered the tragic loss of a child, which allegedly increased her use of alcohol and substances - the crux of the rumors regarding her exit from That '70s Show.

Kelly later revealed that her alcoholism was the real issue. She managed to repair her connections to the series and her character returned in season 5, but that would sadly be the end of her acting career. The scenes with Laurie in the season 6 premiere had to be re-shot due to the casting change, with Kelly's departure preceding Ashton Kutcher's That '70s Show exit.

Meanwhile, Christina Moore left MADtv to take on the role of That '70s Show's Laurie. Moore previously worked on shows like Beverly Hills, 90210, The Drew Carey Show, and Friends. But Moore's time on That '70s Show ended up being short-lived since she only appeared in six episodes.

Sadly, Lisa Robin Kelly's career or life never fully got back on track after leaving That '70s Show. In 2010, Kelly was arrested for a DUI and she had a history of domestic violence charges. Just before divorcing her husband in 2013, Kelly was arrested for another DUI. A few months later, the actress vowed to get her life and career back on track. Kelly started rehab, but tragically passed away in her sleep, and her death was later blamed on an accidental overdose.After Lisa Robin Kelly's death in 2013, That '70s Show cast members paid tribute to their costar. This includes That '70s Show Hyde actor Danny Masterson, who took to Twitter to say, "Terrible, awful news.

Brilliant on 70s.... See u next time LRK, kisses. RT @sdavis53: #RIPLisaRobinKelly aka Laurie Foreman." Kurtwood Smith, who played Red Foreman, also came out with a statement regarding Lisa Robin Kelly. The veteran actor said, "I am so sorry to hear about Lisa's passing away. I know the last 10 years have been such a difficult struggle for her, but I will always remember the lovely, funny, and very talented young lady I worked with."