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Actor Gavan O'Herlihy had come a long way from his co-starring stint on the American TV sitcom Happy Days when he headed the cast of the British miniseries A Killing on the Exchange. O'Herlihy was seen as Dan Maitland, an American stockbroker who was transferred by his firm to the London exchange. No sooner had Dan arrived than he found himself up to his well-groomed neck in murder and treachery. With such "usual suspects" as Joss Ackland and Michael Gough in the supporting cast, was it any wonder that it took so long for the cops to solve the mystery at hand? The six hour-long episodes of A Killing on the Exchange were seen courtesy of Anglia Television in 1987.