Ryan O'Neal

Farrah Fawcett's longtime partner Ryan O'Neal has asked the ailing actress to marry him again.

"I've asked her to marry me again, and she's agreed," O'Neal, 68, told Barbara Walters in a 20/20 interview airring Friday. He described the 62-year-old actress battling cancer to be "fighting for her life."

Though O'Neal said he used to ask Fawcett to marry him "all the time," he asserts that this is the real deal. "I promise you we will — absolutely."

"We will, as soon as she can say yes... maybe we can just nod her head," O'Neal said, laughing.

O'Neal explained how he already picked out his outfit for the ceremony: "Like a gigolo, you know? And a little thin mustache and slicked-back hair. I don't know. We have fun; we tease about that."