Claire did not die "as seen in season 6 episode 6"
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Claire Johnston died in 1987.
She got raped
Clair Weeks died on August 26, 1996, in Los Alamitos, California, USA.
Claire Brennen died on November 27, 1977, in Hollywood, California, USA of cancer.
Earlier in the movie, when Claire and Doug are having an intense conversation, Claire says: "It sounds weird, but ons sunny days I always think of someone dying". So in fact she warns Doug not to come over (then he would be the one who is going to die).