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Diahann Carroll was to have joined The Colbys as a full-time regular for it's 3rd season, however, it was cancelled.
There were rumors she would return in the last season of Dynasty or the following, but these failed to be realized.
Dominique might have saved the Colbys. A shame she never returned for the final Dynasty season. She, like Claudia and unlike Amanda was hugely missed.
Aparently Catherine oxenburg demanded the same sallery as Linda Evans and Joan Collins etc. But what on earth made her think she was worth that is anyone guess. She was a truly awful actress and threatened not to come back right after filming the final with her still in the hotel as the fire took hold. The writers simply recast her with the superious Karen Cellini to write the charactor out prooperly. Catherine must have thought the show would have to adhere to her demands to wrap up the charactor, but haha they had the last laugh.
pamela Sue Martin as others have said left to make films. Joan Collins recently bitched about her in an interview for the show "After Dynasty" saying that she warned her not to leave but she didn't listen and then bitcherly said "and what films has she been in".