Lou Ford is the main villain of The Killer Inside Me . He is the 29 year old deputy sheriff of texas town of Central City. He's a sociopath with sadistic sexual tastes who killed people and framed them as murderers.
Lou and his adopted brother Mike grew up in their childhood until Mike caught Lou raping a 5 year old girl and volunteered to serve prison time to protect Lou for many years. Mike died years later while working at the construction firm of Chester Conway and Lou believed that Chestar killed his brother. At some point in the film, Lou discover nude SM photos of her mother taken by his father, hide in the Bible of his library. This make him remember that during his childhood, he had his mother who ask to beat her and show him her body saying that he will be a big boy if he see what his father do to her and if he does the same. This treatment can be a possible explanation for the existance of his sociopathic side. Soon after the beginning of the film, Lou met a young prostitute named Joyce Lakeland who had an affair with Conway's son. Lou beat her and discovered she enjoyed the pain although, Lou was engaged to his longtime girlfriend Amy. He had a love affair with Joyce until he betrayed her by beating into coma and when Elmer arrives, Lou shoots and kills him and framed him as Joyce's murderer however Conway beleived that Joycee as his son's murderer. Lou's fiance Amy begun suspected that Lou is unfaithful to her and county district attorney, Howard Hendricks suspects that Lou could be behind the murders and Sheiff informed to Lou that Joycee passed away from injuries and Lou discovered that his father was prevent who click the nude photos of his victims which lead to his suicide. He committed suicide along with Joyce and others.