The Killer Inside Me (2010)

Lou Ford (Casey Affleck) is a deputy sheriff living in a small West Texas town in the 1950s. He is sent to investigate a girl thought to be a prostitute, Joyce Lakeland (Jessica Alba), and winds up beginning a sexual relationship with her. He plots to kill her boyfriend, the son of the town's wealthiest and most powerful citizen. This leads to a second murder, a false accusation, a blackmail, and more murders. As his sociopathic side begins to manifest itself with increasing brutality, Lou has a more and more difficult time convincing his girlfriend Amy (Kate Hudson), the district attorney (Simon Baker), and a local union leader (Elias Koteas) that he is innocent.

The biggest problem here is the controversial scenes of violence against women, which are highly disturbing and not at all easy to watch. But if viewers can stomach them and get past them, Casey Affleck's Lou Ford makes a fascinating character, and it's interesting to watch his mental and emotional journey. It's possible to even root for him to find some sort of inner peace. A fine cast provides strong support for him.