Desc: In the Line of Duty: A Cop for the Killing: Directed by Dick Lowry. With James Farentino, Steven Weber, Susan Walters, Harold Sylvester. A look at the dangerous and bizarre life of an undercover cop who lives on the edge and the strife and heartbreak that comes with the job. There is also a tremendous amount of guilt and psychological pain when when an undercover sting goes bad and they lose a comrade in the line of duty.