movie where sister gets killed then he scalps other blonde girls

A wealthy New York investment banking executive hides his alternate psychopathic ego from his co-workers and friends as he escalates deeper into his illogical, gratuitous fantasies.

An artist, Chance finds the perfect muse, Charlie, for his work. Despite the best efforts of his girlfriend Lily and his mentor Marius, Chance blurs the line between inspiration and obsession and twists his way through Charlie's life. When Chance sees that Charlie has a boyfriend, Michael, he realizes that in order to achieve inspiration sacrifices must be made.