Jewel's experience came in handy in an unexpected way during a key scene in the film, which premieres at 9 tonight.
Her character is shown writing the movie's title song, which became a signature hit for future husband Johnny Cash. She writes about falling in love with someone not her spouse, figuring she was going to hell -- the "ring of fire" -- for it.
"It would have been very difficult to do if I hadn't written songs and known what my process was," Jewel said. "I had no idea what it was like for her to write. So I just had to write like I did."
The movie is based on the book about June's life, "Anchored in Love," written by son John Carter Cash.
While the 2005 theatrical film "Walk the Line" depicted June and Johnny's love story mostly from his perspective, "Ring of Fire" is a portrait of June before she met Johnny, during their courtship and through their long marriage.
"She was a really, really charismatic, bright woman who was formerly known as Johnny Cash's wife, and I'm glad Lifetime decided to tell her story, because she had an amazing career before she even met Johnny," Jewel said.
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