RANCHO MIRAGE — Marcia Lucas died at age 80 on Wednesday from metastatic cancer in Rancho Mirage, California, surrounded by loved ones. Her death was confirmed by a lawyer for her family.

Lucas won an Academy Award as editor of the original 1977 “Star Wars” and also edited 1983’s “Return of the Jedi.” She was the editor on George Lucas–directed films “THX 1138” and “American Graffiti,” and contributed to Martin Scorsese’s 1970s films “Taxi Driver,” “Alice Doesn’t Live Here Anymore,” and “New York, New York.”

She was married to George Lucas from 1969 to 1983. During the editing of “Star Wars,” she convinced her then-husband that Obi-Wan Kenobi, played by Alec Guinness, should die in his lightsaber duel with Darth Vader and become a spirit guide to Luke Skywalker. George Lucas later told Rolling Stone: “It was extremely complex and we had 40,000 feet of dialogue footage of pilots saying this and that. And she had to cull through all that, and put in all the fighting as well.” He added: “Nobody really has ever tried to interweave an actual plot story into a dogfight, and we were trying to do that.”

Born Marcia Griffin in Modesto, California shortly after the end of World War II, she moved to Los Angeles with her mother after her parents divorced when she was a small child. She began her career as a film librarian and later edited commercials, trailers, and promotional films. She served as an assistant editor on the documentary “Journey to the Pacific” for Verna Fields, who also hired George Lucas when he was a film student at the University of Southern California. The two became engaged soon after working together. Their marriage effectively ended in 1982, though they kept their divorce private until after the 1983 release of “Return of the Jedi.” Lucas later married Tom Rodrigues, a production manager at Skywalker Ranch, from 1983 to 1993.

She is survived by her daughters, Amanda Lucas and Amy Soper, and grandchildren Felix Hallikainen, Aeliana Hallikainen, and Knox Soper. A family statement said: “Her work was known for its emotional intelligence, rhythm, and humanity — a rare ability to find the truth of a scene and bring heart, momentum, and clarity to the screen.” The statement added: “Her influence on film is indelible, but those who knew her best will remember the way she made life feel more vivid, more beautiful, more fun, and more full of love.”