According to Variety, Ben Affleck will play George Reeves and Diane Lane will also star in Focus Features' Truth, Justice and the American Way, the story of a Los Angeles gumshoe trying to solve Reeves' mysterious death.
Reeves met a tragic, mysterious end in 1959 after years portraying TV's Superman.
As previously announced, Adrien Brody stars as the detective investigating Reeves' death. Lane will play Toni Mannix, the Hollywood wife of a studio exec who may have been linked romantically to Reeves.
The script also centers on Reeves' complex relationship with the iconic role that propelled him to stardom.
he picture starts shooting this summer, with Allen Coulter helming.
"Truth" was penned by Paul Bernbaum, with a final draft by Howard Korder.