Hilary Swank has confessed when she first heard the story of her new film Conviction, she couldn't believe it was true.
The Oscar winner stars alongside Sam Rockwell, Minnie Driver and Juliette Lewis in the real life story of unemployed single mother Betty Anne Waters, who, with the help of attorney Barry Scheck from the Innocence Project, exonerated her wrongfully convicted brother.
Hilary said: "There's a part of you that has to be like, 'This could never happen'. And then you realise that it is happening."
Betty Anne's brother Kenny spent 18 years on a murder conviction while his sister laboured through law school just to prove his innocence.
Sam Rockwell, who plays Kenny, revealed: "The truth is, he was volatile.
"He had a temper, but he also was a very charming guy and from what I heard, he was very childlike. He was a complicated guy."
Kenny died aged 48 of head injuries from a fall, six months after his release.
Betty Anne, though ambivalent about the attention, said her brother was always thrilled by the idea of a Hollywood movie and the phone that wouldn't stop ringing.
Betty Anne said of his reaction to the Hollywood interest: "'I'm answering it - it's probably Hollywood calling again'. He loved it, and he's like, 'Betty Anne, you have to do this movie.'"