Mark Hamill, Daisy Ridley, and Laura Dern could not help but remember their former co-star and legendary actress, Carrie Fisher, while promoting "Star Wars: The Last Jedi" ahead of its premiere on December 15. On the sidelines of D23 Expo over the weekend, the actors graced an interview with Entertainment Tonight where they shared their thoughts about losing someone they look up to.

'Irreplaceable part of legacy'

Hamill, best known as Luke Skywalker in the "Star Wars" franchise, said he still thinks of Carrie Fisher like she is alive. He even said that her legacy will continue to live on even after her sudden death in December 2016.

He also added that just like their films, which were about triumph and tragedy, all of them were challenged when the co-actor passed away.

The 65-year-old actor went on to talk about Carrie Fisher's daughter, Billie Lourd, whom he said resembles the late actress. Hamill added it is "satisfying" to see the "Scream Queens" star participate in the upcoming "Star Wars: The Last Jedi" movie where she will play as Lieutenant Kaydel Ko Connix.

Ridley, on the other hand, described her feeling for the movie as "bittersweet" knowing that the late actress will not be around to celebrate it with them. She even confessed that everyone is still in the process of accepting the death of someone who has left them so much to remember.

She said seeing Carrie Fisher's footage in "The Last Jedi" has brought her back to those days when she was working with the veteran actress. Ridley added she was having mixed feelings while watching Princess Leia's scenes in the upcoming film.

Meanwhile, Dern, who is a newbie in the lineup, credited Carrie Fisher for her contribution to the success of the franchise.

She labeled the late actress as an "icon" to all "Star Wars" fans and an inspiration to young girls and a model of feminism. "Getting to be part of a tribute to her and her work and legacy by being a part of "Star Wars" was amazing," she said.

Carrie Fisher's sudden death

The legendary actress, who played as Princess Leia, was 60-years old when she passed away due to sleep apnea.

The "Star Wars" star was bound for Los Angeles when she reportedly stopped breathing while on board. Carrie Fisher died after four days of being admitted to the intensive care unit (ICU) at UCLA Medical Center.

Just recently, the coroner finally released the findings in her death which was confirmed to be "sleep apnea and other undetermined factors."