Schizophreniac: The Whore Mangler

Schizophreniac The Whore Mangler is 1997 exploitation film written, directed and produced by Ron Atkins. The film was followed by two sequels, Necromaniac Schizophreniacin 2003 and The Cuckoo Clocks of Hell in 2011, the latter being a crossover with Last House on Dead End Street.

As his mind deteriorates, Harry confesses to Rubberneck that his parents neglected, beat, humiliated and raped him throughout his childhood, and that he murdered his father when he tried to leave him and his mother. Harry kills Drew during an argument about his impotence, rapes her body, and eats one of her breasts. While experiencing another psychotic episode, Harry assaults a fence, and castrates and shoots his partnerincrime. By this point, the authorities realize a serial killer is running amok.At a pornographic theatre, Harrys obnoxious behavior annoys the other patrons, who he butchers via bludgeoning, slashing and shooting. Seeing a newscast identify him as the serial killer, Harry unsuccessfully tries to dispose of Rubberneck, and has a complete mental breakdown. After suffering a series of nightmares and hallucinations, Harry strangles a neighboring little girl, changes his appearance, and goes on the run with Rubberneck. ........

Source: Wikipedia