Whitney’s cover of the song wasn't supposed to happen; she had originally planned to cover Jimmy Ruffin's "What Becomes of the Brokenhearted" as the theme song for The Bodyguard.
Early into production, it was discovered that “What Becomes of the Brokenhearted” had just been used in the film Fried Green Tomatoes. Kevin Costner (who was also a producer on the film) suggested the song be replaced with "I Will Always Love You,” bringing in Linda Ronstadt's version of the song for Whitney to hear.
Whitney loved the song and worked with producer David Foster to rearrange the tune into more of pop-soul ballad.
Of course, the song was a huge hit; it spent a then record 14 weeks at No. 1 on U.S. Billboard Hot 100.
"I Will Always Love You" has since become Whitney's signature song.