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James Farentino plays the chief of a big-city underground narcotics unit. When a drug buy goes awry, a shotgun blows away one of Farentino's best men--and closest friends. As the once-harmonious drug unit disintegrates into recriminations and guilt, Farentino becomes more and more withdrawn, until he's of little further value to the force. A chance for redemption for everyone arrives in the form of another big-time drug bust. In the Line of Duty: A Cop for the Killing was based on a true story, as were all the In the Line of Duty films produced for television in the late 1980s--early 1990s.