US actor Scott Haze spent months in isolation and slept in caves to prepare for his role as a necrophiliac in James Franco's Child of God, which has premiered in Venice.
Based on Cormac McCarthy's novel of the same name, Haze stars as Lester Ballad, a violent man living on the fringes of society who descends to the level of a cave dweller and forges relationships the only way he can - by killing women and having sex with their bodies.
"Scott isolated himself for three months. He spent nights in caves and when he finally turned up he was transformed, and kept himself isolated for the whole shoot," said Franco, who described it as "a performance of a lifetime."
McCarthy's killer is based on real-life murderer and body snatcher from the 1950s, Ed Gein - who also inspired the films Psycho and Silence of the Lambs - and Haze said he had drawn on the Joker character from Batman for inspiration.
"It was hard being isolated, but I was driven by a sense of responsibility to McCarthy, to really capture the character's animalistic element," the 25-year-old said.