Lisa Robin Kelly(1970-2013)

She first made her acting debut at age 21 in a 1992 episode of Married... with Children (1987), and went on to guest-star in many popular television shows, such as Murphy Brown (1988), The X-Files (1993), Sisters (1991), and Silk Stalkings (1991), and appeared in many obscure, straight-to-video/TV movies. She finally earned her big break and minor celebrity status at age 28, with her role as "Laurie Forman", the promiscuous elder sister of "Eric Forman" on That '70s Show (1998). The character garnered her #6 placement on Maxim's TV's "Best Nymphos" list. She enjoyed brief success, mild publicity and increased output during the first two years of the show, including one of her only high-profile movies, Jawbreaker (1999). She developed drug problems during filming of the third season of "That '70s Show" and was fired. It was explained that her character Laurie was off attending beauty school.

She briefly returned to the show in the fifth season and was offered appearances in 13 episodes of the sixth season. She filmed the first few episodes, but was replaced by Christina Moore, as she was in the midst of a key story and her character couldn't up and leave again. Fox stated this was a mutual agreement, and Wilmer Valderrama, with whom she spent most of her screen time in season five, said she wanted to try other things. Her agent restated that adding that she had been clean for two years. According to IMDb, she has had only one credit since her final exit from the show: the 2005 film The Food Chain: A Hollywood Scarytale (2005).