Redgrave talked about the end of her 30-year marriage to actor John Clark when she appeared on "Larry King Live" in 2003 "Celebrity Justice" reported Tuesday.
Redgrave told how her husband broke the news in 1998 that he fathered a child with his former assistant, a woman who had since married the couple's son. The child, Zachary, whom Redgrave had treated as a step-grandson, was actually her husband's child.
"I don't know how I dealt with it. I went to a shrink," Redgrave said to King.
When King said, "One would think after that many years, you knew your husband," Redgrave answered, "You would. And I didn't."
In the suit, Clark alleges King ignored his email requests to offer a rebuttal and he was never asked for his side of the story, "CJ" reported.