The Minus Man

The Minus Man is a 1999 film starring Owen Wilson and Janeane Garofalo, based on the novel by Lew McCreary, and directed by Hampton Fancher, who also wrote the screenplay. The film centers on a serial killer whom Fancher describes as a cross between Psychos Norman Bates, Melvilles Billy Budd and Being Theres Chauncey Gardner.

As he is tidying up, Vann passes out and daydreams that he is digging a grave. Detectives Blair and Graves Dwight Yoakam and Dennis Haysbert stand over him, asking taunting questions about his methods. Throughout the film, Vann has imaginary conversations with the two detectives. Vann is shown retrieving a kit from under his car. It contains the poison he uses on his victims, which he places in a flask and fills with amaretto.Doug takes Vann to a high school football game, where he meets a star athlete and his family. A few days later, Vann offers the boy a ride and murders him, burying his body on a beach. Vann reveals that the murder of the footballer broke two of his personal rules Dont kill anyone you know, and dont kill anyone from your town. ........

Source: Wikipedia