One of those scenes, it turns out, was the famous moment where Luke first liberates Leia from the Empire and says, "I'm Luke Skywalker, I'm here to rescue".
Hamill didn't give any specifics about how Luke would die in Lucas' version, likely because they weren't entirely worked out. "Which is another thread that was never played upon [in The Last Jedi]".
However, in an interview with IGN, Hamill revealed that Lucas meant to kill off Luke at the end of "Episode IX" after he had trained his twin sister General Leia Organa (Carrie Fisher) the ways of the Force.
It sounds as though Lucas' idea was similar to what occurred in the Expanded Universe, with Luke training Leia to be Jedi and carrying those ideals into the future. Was it a few years ago, when he revealed to the actor that there would be more Star Wars movies?
Despite only returning for 30 seconds at the end of J.J Abrams" 2015 "The Force Awakens", Hamill had a larger role in Rian Johnson's "The Last Jedi' - which was released past year.
When asked if he would appear in yet-to-be-named Episode IX, which is being co-written and directed by J.J. Abrams, Hamill responded: "No one's really talked to me about it".
This image released by Lucasfilm shows Mark Hamill as Luke Skywalker in "Star Wars: The Last Jedi", in theaters on December 15. Lucasfilm president Kathleen Kennedy ultimately ditched the majority of Lucas' treatments for the third trilogy in favor of J.J. Abrams and Lawrence Kasdan's script for The Force Awakens.