Photo courtesy of Kevin Mazur/ Getty Images

Welcome Back Kotter actress Marcia Strassman has died at the age of 66. Her sister, Julie Strassman, confirmed her passing after a long battle with breast cancer.

Marcia also appeared in Honey I Shrunk the Kids and Honey I Blew Up the Kid. Julie said in a statement, "She was the funniest, smartest person I ever met. And talented. She knew everything. Now I won't be able to call her and ask her questions."

Cher tweeted about the loss on Saturday (October 25th) by writing, "Wanted U2 No,a Funny,Talented Friend Died.Not 4U 2feel sorry 4me,but she died alone, &Energy from U is powerful &Sends 'Marsha Strassman'"