The Alphabet Killer was a pretty run of the mill serial killer flick. Eliza Dushku stars a cop that goes crazy, investigating the case of The Alphabet Killer (Apparently based on a real life case). Then there's Cary Elwes as her fiancé/superior officer and Tom Noonan, now as a cop (which is funny because he once played a child killer on the X-Files).
The plot follows a lot of the beats of the genre: the obsessive cop going off the rails, you're off the case!, third act plot twist, fighting with the colleague and then turning him around,... Would make for a good double feature with Kiss The Girls.