Transcript for Joely, Tricia Fisher on Their Last Conversation with Carrie Fisher
Carrie fisher lived a very public and open life. But there's a side to the legendary "Star wars" actress that only her family knew. And tonight we're getting a glimpse courtesy of her two sisters who sat down with ABC's Chris Connelly for an exclusive interview. The world lost Carrie and princess Leia. We lost our hero. We lost our mirror. We hung on to every word that she said. We had the coolest big sister in the world. She was a bad-ass, bawdy, gun-toting princess. Who has that? She also had a brilliant mind that was unlike anybody else. I was invited to go to a mental hospital. And, well, you don't want to be rude, right? So you go. Last night we both watched "Wishful drinking" on HBO. Just the fact that that energy is gone from the world is hard to wrap your head around. Reporter: Jolie and Tricia were raised by mom Connie Stevens. Carrie raised by her mother Debbie Reynolds. The three shared a father, the late Eddie fisher. ??? May I thank you ??? When you were in his presence, you felt like you were the most important, most beautiful, most special person in the world. And then he would go away. And not show up. So we all three had that experience. And I think we longed for him most of our lives. We grew together more like sisters than one would imagine. And we looked to her to see how to gauge, how to handle things that were thrown at us in life. Like how was she going to do this? Reporter: Actresses with sharp minds like their big sister. Tricia would guest on shows. I just wish that we could tell her that it doesn't matter. Reporter: Jolie would star on sitcoms like "Till death." This is my day, my day! Reporter: And "Ellen," with admiration for Carrie dating back to their youth. They will cater to our every whim! I remember seeing her in a 40-foot closeup and going, wow, that's my sister on screen. That's actually how I knew about her. "Star wars." How did her initial success give her lessons that she helped to pass along to you as you began your entertainment career? I'm not sure that at the beginning she handled everything all that well. Sometimes it was like, do as I say, not as I do. What did you know about her that maybe the rest of us did not? I think that she was more sensitive. She was secretly soft. Secretly a young girl for all of her edge and her sass and her wisdom and all of that. I think maybe I saw that. Like she wanted to be sisters and hang out and put makeup on in the bathroom mirror. She was extremely generous. Like you would walk in and she would just hand you something in her room. We laid on her floor one night and she said, I have these diaries from "Star wars," and read them to me. That was a decade ago. I know she said she just found them. She wasn't telling the truth. She read those to me. So I feel like I got to be in on the joke. A little bit. And that is important to me. Reporter: A final conversation via text filled with talk of family and loved ones. We talked about age. Because she was floored that she had just turned 60. We talked about our children. We talked about our frail mothers. And promised to see her for Christmas. Reporter: After learning of her heart attack on that flight to L.A. From London, it was a promise these two sisters would keep at Carrie's bedside in the hospital. There with Carrie's 24-year-old daughter, Billy lourd. She's an amazing, soulful, amazing, smart girl. Yeah. She was obviously, you know, rattled to her core. But she was handling it. And loving and generous and inclusive and everything that you would want your daughter to become. What did you want your sister to know as you sat in that room with her? 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. And then I told her she would love how high she was right now. You knew your sister very well. Yeah. Tender moments as well with Carrie's legendary mother. And I sat with Debbie. And she said to me that -- she said she was praying for more time. She kept saying that she was -- she wanted more time. And then she told me that she prayed for more time for our mom and herself. And I knew. I knew that if Carrie wasn't going to survive this, that Debbie would not. You knew it. You could feel it. You could see it in her face. She would not last without her on the planet. She wouldn't. And she didn't. In true form, in true form. This is a "Postcards from the edge" moment. She was not going to -- she wasn't going to let her go. Reporter: Carrie's brother Todd was there for their mother's final moment. She didn't die from a broken heart. She just left to be with Carrie. She expressed how much she loved my sister. She then said that she really wanted to be with Carrie. And within 15 minutes from that conversation, she faded out. And within 30 minutes, she technically was gone. And I watched her leave and go to Carrie. Reporter: Debbie Reynolds would die a day after Carrie, whose passing leaves Jolie and Tricia in deep grief and sweet remembrance. I felt cooler and more interesting by being near her. I felt special by having her as a sister. It made me special. When you want to conjure up the happiest memory you can of Carrie, what does it look like? It's more like getting to have her one on one. And not share her. That's what I think of. Being able to just be with her in her home or wherever. And have her to myself. Reporter: For "Nightline," I'm Chris Connelly in los Angeles.
This transcript has been automatically generated and may not be 100% accurate.