The bad son (2007)

The women in a Seattle serial killer's life often had an unpleasant way of turning up dead - from his girlfriend to his mother-in-law to his second wife. The police and FBI knew who the killer was, but were never prepared to face a bizarre twist in the case-that his own mother was an employee of the Seattle Police Department with access to confidential documents--and was a woman who didn't hesitate to interfere with justice...