Carrie Fisher's Half-Sisters Open Up About Their Final Conversation With 'Star Wars' Actress

Joely and Tricia Fisher promised to take care of Carrie Fisher's daughter, Billie Lourd, in their final moments together.
2:05 | 01/04/17

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Transcript for Carrie Fisher's Half-Sisters Open Up About Their Final Conversation With 'Star Wars' Actress
Finally, two sisters and their final exchange with sister Carrie fisher. They all shared a father, but they knew of Carrie's bond with her mother. Here's ABC's Matt Gutman. Reporter: Carrie fisher's fame spanned across galaxies. The world lost Debbie, and Carrie of course, and we lost our hear. We lost our mirror. What are you doing? Somebody has to save our skins. Reporter: She even loomed large to her half sisters. Tricia and joely fisher opening up to our Chris Connolly. I do remember seeing her on, you know, in a 40-foot close-up, and going, "Wow. That's my sister." We had the coolest big sister in the world. She was a bad ass, bawdy, gun-toting princess. I mean, who has that? I think that she was more sensitive. She was secretly soft. Reporter: And aware of her mortality. Hours before that fatal heart attack on this flight -- joely texting the sister she shared with father, Eddie fisher. We talked about age because she was floored that she was 60, we talked about our children and our frail mothers. Reporter: Carrie fisher's mother was the Hollywood legend, Debbie Reynolds who died just a day later. I knew that if Carrie wasn't going to survive this that Debbie would not. You knew it. Reporter: In those final moments, Carrie's sisters promising her they would take care of her beloved daughter, Billie. I remember just holding her hand, and telling her that we were there, that we would make sure that her daughter was whole. Which she will be. She definitely adored Billie, you know, as the most amazing accomplishment of her life. Our thanks to Matt Gutman and the fisher sisters for sharing their thoughts tonight. And thank you for watching here on a Tuesday. Hope you had a great new year. We're off and running. See you tomorrow.

This transcript has been automatically generated and may not be 100% accurate.

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