After by 20 years of dating, it was recently announced that Farrah Fawcett and Ryan O’Neal will tie the knot.

“I’ve asked her to marry me, again, and she’s agreed,” O’Neal, 68, tells Barbara Walters in an exclusive interview on “20/20” which will air that Friday, June 26.

The 62-year-old Fawcett - who was diagnosed with anal cancer in 2006 - is now “fighting for her

But Ryan says they will wed “as soon as she can, say yes. … possibly we can just nod her head.”

In May, O’Neal told NBC News that he has always “joked” about the two getting married, but now it’s no joke as he has fallen more in love with Fawcett as he watches her bravely battle cancer.

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