Original reports stated that the Sons of Anarchy actor exited the project due to the FX series commitment, however sources have confirmed that Hunnam was overwhelmed with the massive attention from being cast and got cold feet.
Hunnam previously starred in Pacific Rim, Children of Men, Cold Mountain, and currently stars in the biker drama Sons of Anarchy.
Production for the film was set to start in November, and there is no word yet of Hunnam’s replacement.
Fifty Shades of Grey follows the racy relationship between college student Anastasia Steele and 27-year-old billionaire Christian Grey.
Directed by Sam Taylor-Johnson, Fifty Shades of Grey is set to be released on Aug. 1, 2014.