Lisa Robin Kelly (aka Laurie Foreman) has died.

So sad!  

(CNN) -- Actress Lisa Robin Kelly, one of the stars of TV's "That '70s Show," has died, according to her agent, Craig Wyckoff.
Kelly was 43, according to her biography on the Internet Movie Database.

"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. I spoke to her on Monday and she was hopeful and confident, looking forward to putting this part of her life behind her. (Wednesday) night she lost the battle. Cause of death has not been issued yet and no death certificate has been issued either," Wyckoff said.

Kelly played Laurie Forman, older sister of Eric Forman, played by actor Topher Grace, on "That '70s Show," which ran from 1998 to 2006.

This is at least the second celebrity death this week. How very sad.

So young, yet so sad. It seems like not shocking anymore with young stars dying so young.

That's how I feel about it, too. There are so many young stars dying. It's a shame.

Very sad...she's been going down this road for a long time now.  To look at the pictures of her that showed such a beautiful young woman, to what had become of her.... ....I just don't know how people can get hooked onto drugs after seeing the outcome of some people like this who are in the 'spotlight'. May she finally have the peace in heaven that she couldn't find here on earth.

I don't understand it either how young stars get into drugs