Ryan O'Neal, Farrah Fawcett engaged to marry

Farrahfawcett_ryanoneal Ryan O'Neal and Farrah Fawcett plan to finally make their longtime relationship official.

O'Neal revealed to Barbara Walters on "20/20" that they plan to marry.

"I've asked her to marry me, again, and she's agreed," says O'Neal, 68.

Check out pictures of Farrah Fawcett through the years.

O'Neal says that Fawcett -- with whom he has a 24-year-old son, Redmond -- who is "fighting for her life" against anal cancer still plans to marry despite her debilitating illness.

They plan to wed "as soon as she can say yes. ... Maybe we can just nod her head."

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